Citation Profile: Open Access publications from University College London / Economists Online Archive

Open Access publications from University College London / Economists Online Archive

Most cited documents in this series:

Year Title Cited
1997 Formal and real authority in organizations.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17678/ [Citation Analysis] 397
1997 Quadratic engel curves and consumer demand.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/14165/ [Citation Analysis] 228
1998 Technology and changes in skill structure: Evidence from seven OECD countries.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16915/ [Citation Analysis] 228
1998 Implications of skill-biased technological change: International evidence.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16913/ [Citation Analysis] 192
2002 Corporate income tax reforms and international tax competition.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15006/ [Citation Analysis] 161
1994 The management of innovation.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17669/ [Citation Analysis] 152
1998 Consumption inequality and income uncertainty.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15770/ [Citation Analysis] 139
1996 Relative wage movements and the distribution of consumption.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15224/ [Citation Analysis] 137
2002 On adjusting the Hodrick-Prescott Filter for the frequency of observations.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/18641/ [Citation Analysis] 135
1995 Is consumption growth consistent with intertemporal optimization? evidence from the consumer expenditure survey.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15234/ [Citation Analysis] 132
2002 Equilibrium wage dispersion with worker and employer heterogeneity.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17132/ [Citation Analysis] 131
2006 Competition in two-sided markets.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/4324/ [Citation Analysis] 120
2004 Evaluating the employment impact of a mandatory job search program.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15843/ [Citation Analysis] 102
2005 The effect of financial development on convergence: theory and evidence.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17711/ [Citation Analysis] 99
1999 Dualism and macroeconomic volatility.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17683/ [Citation Analysis] 90
2005 PPP strikes back: aggregation and the real exchange rate.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/18615/ [Citation Analysis] 79
2006 Distance to frontier, selection, and economic growth.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17712/ [Citation Analysis] 75
1996 Competitive storage and commodity price dynamics.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16840/ [Citation Analysis] 59
2004 Identification and Estimation of Hedonic Models.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/14707/ [Citation Analysis] 55
2004 Identification and estimation of hedonic models.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/12718/ [Citation Analysis] 55
1996 The Determinants and Effects of Work Related Training in Britain.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/14837/ [Citation Analysis] 54
1992 Using privileged information to manipulate markets: insiders, gurus, and credibility.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16724/ [Citation Analysis] 54
2002 Asset holding and consumption volatility.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/12650/ [Citation Analysis] 53
2004 Endogenous political institutions.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17704/ [Citation Analysis] 52
1999 The effects of minimum wages on employment: Theory and evidence from Britain.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16931/ [Citation Analysis] 47
2000 Saving, growth, and investment: a macroeconomic analysis using a panel of countries.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15278/ [Citation Analysis] 47
2005 Collective labor supply with children.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/12642/ [Citation Analysis] 45
1989 An outside option experiment.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15606/ [Citation Analysis] 43
2002 The effects of School Quality on Educational Attainment and Wages.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17052/ [Citation Analysis] 42
2004 Mapping the two faces of R&D: productivity growth in a panel of OECD industries.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16510/ [Citation Analysis] 39
2006 Appropriate growth policy: a unifying framework.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17713/ [Citation Analysis] 39
2009 The economics of growth.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17829/ [Citation Analysis] 38
2004 Entry and productivity growth: evidence from microlevel panel data.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15844/ [Citation Analysis] 35
2009 Revisiting the German wage structure.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16423/ [Citation Analysis] 35
2009 The effects of entry on incumbent innovation and productivity.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15901/ [Citation Analysis] 35
2002 Oligopsony and monopsonistic competition in labor markets.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15468/ [Citation Analysis] 34
1994 INCOME AND OUTCOMES - A STRUCTURAL MODEL OF INTRAHOUSEHOLD ALLOCATION.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16866/ [Citation Analysis] 33
1997 Taxing Profits in a Changing World.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/14912/ [Citation Analysis] 31
2005 Entry liberalization and inequality in industrial performance.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17749/ [Citation Analysis] 30
1995 Humps and bumps in lifetime consumption.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15223/ [Citation Analysis] 30
2001 Language fluency and earnings: Estimation with misclassified language indicators.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/12629/ [Citation Analysis] 29
2007 Does inward foreign direct investment boost the productivity of domestic firms?.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/18100/ [Citation Analysis] 27
2002 The demand for money, financial innovation, and the welfare cost of inflation: an analysis with household data.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/12697/ [Citation Analysis] 25
2006 Recent developments in the economics of price discrimination.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/14558/ [Citation Analysis] 24
2000 Balladurette and Juppette: A discrete analysis of scrapping subsidies.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15019/ [Citation Analysis] 23
1983 Macroeconomics after Keynes: a reconsideration of the general theory.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16287/ [Citation Analysis] 23
1996 The evolution of wages in the United Kingdom: evidence from micro data.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/17045/ [Citation Analysis] 23
2003 The new tax credits.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/14860/ [Citation Analysis] 23
2002 Language and the earnings of immigrants.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/16457/ [Citation Analysis] 23
2004 Estimating Euler Equations.
RePEc:ner:ucllon:http://discovery.ucl.ac.uk/15168/ [Citation Analysis] 23

Citing documents used to compute impact factor 49:

Year Title See
2010 Does Schumpeterian Creative Destruction Lead to Higher Productivity? The effects of firms entry
RePEc:gmf:wpaper:2010-20 [Citation Analysis]
2010 DOES FDI SPUR INNOVATION, PRODUCTIVITY AND KNOWLEDGE SOURCING BY INCUMBENT FIRMS? EVIDENCE FROM MANUFACTURING INDUSTRY IN ESTONIA
RePEc:mtk:febawb:69 [Citation Analysis]
2010 Entry and Incumbent Innovation
RePEc:mpg:wpaper:2010_17 [Citation Analysis]
2010 Market Integration and Technological Leadership in Europe
RePEc:euf:ecopap:0403 [Citation Analysis]
2010 Competition and innovation: does the distance to the technology frontier matter?
RePEc:zur:iewwpx:493 [Citation Analysis]
2010 EvoluciÃ³n de la informalidad laboral en Colombia: determinantes macro y efectos locales
RePEc:col:000118:006449 [Citation Analysis]
2010 Informal Employment and the Role of Regional Governance
RePEc:hhs:lunewp:2009_010 [Citation Analysis]
2010 Designing Impact Evaluations for Agricultural Projects
RePEc:idb:brikps:8378 [Citation Analysis]
2010 On the Incidence of Employment Subsidies to Vocational Training
RePEc:kud:kuieca:2010_02 [Citation Analysis]
2010 Polarization and Rising Wage Inequality: Comparing the U.S. and Germany
RePEc:iza:izadps:dp4842 [Citation Analysis]
2010 Wage Inequality and the Changing Organization of Work
RePEc:kie:kieliw:1588 [Citation Analysis]
2010 MakroÃ¶konomische Rahmenbedingungen und die Einkommensverteilung: Welchen Einfluss hat die Finanzkrise?
RePEc:zbw:wuewwb:108 [Citation Analysis]
2010 Child Benefit Reform and Labor Market Participation
RePEc:jns:jbstat:v:230:y:2010:i:3:p:313-327 [Citation Analysis]
2010 Estimating German overqualification with stochastic earnings frontiers
RePEc:spr:alstar:v:94:y:2010:i:1:p:33-51 [Citation Analysis]
2010 The Effect of Product Demand on Inequality: Evidence from the US and the UK
RePEc:iza:izadps:dp5011 [Citation Analysis]
2010 Upgrading or polarization? Occupational change in Britain, Germany, Spain and Switzerland, 1990-2008
RePEc:pra:mprapa:21040 [Citation Analysis]
2010 Polarization and rising wage inequality: comparing the U.S. and Germany
RePEc:zbw:zewdip:10015 [Citation Analysis]
2010 Rising wage inequality, the decline of collective bargaining, and the gender wage gap
RePEc:zbw:zewdip:10014 [Citation Analysis]
2010 Rising Wage Inequality, the Decline of Collective Bargaining, and the Gender Wage Gap
RePEc:iza:izadps:dp4911 [Citation Analysis]
2010 Recent developments in empirical IO: dynamic demand and dynamic games
RePEc:pra:mprapa:27814 [Citation Analysis]
2010 Growth with Time Zone Differences
RePEc:pra:mprapa:20748 [Citation Analysis]
2010 Twenty Years Later and the Socialist Heritage is still Kicking: the Case of Russia
RePEc:unu:wpaper:wp2010-59 [Citation Analysis]
2010 Volkswirtschaftliche Folgekosten unzureichender Bildung: Eine makroÃ¶konomische Projektion
RePEc:ces:ifosdt:v:63:y:2010:i:04:p:24-30 [Citation Analysis]
2010 Erfolg und Misserfolg bei der Ausbildungsplatzsuche: Eine empirische Untersuchung von HauptschÃ¼lern im Landkreis NÃ¼rnberger Land
RePEc:zbw:faulre:67 [Citation Analysis]
2010 Environmental Tax Reform and Growth: Income Tax Cuts or Profits Tax Reduction
RePEc:kap:enreec:v:47:y:2010:i:4:p:549-565 [Citation Analysis]
2010 Grandville, Olivier de La: Economic Growth: A Unified Approach
RePEc:kap:jeczfn:v:101:y:2010:i:3:p:283-286 [Citation Analysis]
2010 Research, technological change and financial liberalization in South Korea
RePEc:eee:jmacro:v:32:y:2010:i:1:p:457-468 [Citation Analysis]
2010 Marrying Up: The Role of Sex Ratio in Assortative Matching
RePEc:sip:dpaper:09-030 [Citation Analysis]
2010 Veto Players and Policy Trade-offs. An Intertemporal Approach to Study the Effects of Political Institutions on Policy
RePEc:sad:wpaper:101 [Citation Analysis]
2010 Politicians, Bureaucrats and Targeted Redistribution: The Role of Career Concerns
RePEc:cfr:cefirw:w0148 [Citation Analysis]
2010 Voluntary Contributions by Consent or Dissent
RePEc:pra:mprapa:22001 [Citation Analysis]
2010 Unemployment Insurance with Hidden Savings
RePEc:pra:mprapa:23214 [Citation Analysis]
2010 Review of Economic Theories of Regulation
RePEc:use:tkiwps:1018 [Citation Analysis]
2010 The Year in Economics at the FCC: A National Plan for Broadband
RePEc:kap:revind:v:37:y:2010:i:4:p:279-290 [Citation Analysis]
2010 Price and Quality Competition
RePEc:pra:mprapa:21647 [Citation Analysis]
2010 Behavioral economics as applied to firms: a primer
RePEc:pra:mprapa:20356 [Citation Analysis]
2010 Behavioral Economics as Applied to Firms: A Primer
RePEc:ces:ceswps:_2937 [Citation Analysis]
2010 Mind the Gap: Education Inequality at the Regional Level in Portugal, 1986-2005
RePEc:gmf:journl:y:2010:i:32:p:22-43 [Citation Analysis]
2010 Credit constraints and durable consumption
RePEc:hhs:bofrdp:2010_015 [Citation Analysis]
2010 Does Consistency Predict Accuracy of Beliefs?: Economists Surveyed About PSA
RePEc:pra:mprapa:24976 [Citation Analysis]
2010 Does consistency predict accuracy of beliefs?: Economists surveyed about PSA
RePEc:pra:mprapa:26590 [Citation Analysis]
2010 University Drop-out in Italy
RePEc:upo:upopwp:134 [Citation Analysis]
2010 The Determinants of Educational Attainment, University Drop-out and Time-to-Degree. A focus on Italy
RePEc:upo:upopwp:132 [Citation Analysis]
2010 Non-smooth Dynamics and Multiple Equilibria in a Cournot-Ramsey Model with Endogenous Markups
RePEc:cdf:wpaper:2008/21 [Citation Analysis]
2010 Discriminatory Prices, Predation and Signal-Jamming in a Horizontal Differentiation Model
RePEc:kap:jincot:v:10:y:2010:i:2:p:87-104 [Citation Analysis]
2010 Rational Inattention to Subsidies for Charitable Contributions
RePEc:cpr:ceprdp:7760 [Citation Analysis]
2010 The distributional and welfare impact of inflation in Italy
RePEc:sap:wpaper:wp134 [Citation Analysis]
2010 Welfare and Pricing of Mail in a Communications Market
RePEc:tse:wpaper:22482 [Citation Analysis]
2010 Welfare and Pricing of Mail in a Communications Market
RePEc:ide:wpaper:22459 [Citation Analysis]

Cites in year: CiY

Recent citations received in: 2010

Year	Title	See
2010	Group Membership, Competition, and Altruistic versus Antisocial Punishment: Evidence from Randomly Assigned Army Groups RePEc:inn:wpaper:2010-24	[Citation Analysis]
2010	Learning unethical practices from a co-worker: the peer effect of Jose Canseco RePEc:pra:mprapa:24232	[Citation Analysis]
2010	The causes and economic consequences of envy RePEc:spr:series:v:1:y:2010:i:4:p:371-386	[Citation Analysis]

Recent citations received in: 2009

Year	Title	See
2009	2008 Lawrence R. Klein Lecture âComparative Economic Development: Insights from Unified Growth Theory RePEc:bro:econwp:2009-10	[Citation Analysis]
2009	Booms, Recessions and Financial Turmoil: A Fresh Look at Investment Decisions under Cyclical Uncertainty RePEc:ces:ceswps:_2759	[Citation Analysis]
2009	GestÃ¤rkt aus der Krise: Potenziale fÃ¼r wissensbasiertes Wachstum RePEc:ces:ifosdt:v:62:y:2009:i:10:p:03-07	[Citation Analysis]
2009	Investitionen in das Breitbandnetz im Spannungsfeld zwischen Wettbewerb und Regulierung RePEc:ces:ifosdt:v:62:y:2009:i:10:p:08-11	[Citation Analysis]
2009	Bildungssystem, PISA-Leistungen und volkswirtschaftliches Wachstum RePEc:ces:ifosdt:v:62:y:2009:i:10:p:23-28	[Citation Analysis]
2009	Breitbandinfrastruktur und wissensbasiertes volkswirtschaftliches Wachstum RePEc:ces:ifosdt:v:62:y:2009:i:23:p:29-34	[Citation Analysis]
2009	Financial Innovation and Endogenous Growth RePEc:cpr:ceprdp:7465	[Citation Analysis]
2009	Country Size, Appropriate Policy, and Economic Performance: Some Evidence from OECD Countries RePEc:fce:doctra:0908	[Citation Analysis]
2009	Some Thoughts on Industrial Policy and Growth RePEc:fce:doctra:0909	[Citation Analysis]
2009	Political institutions as substitute for democracy: a political economy analysis of economic growth RePEc:fgv:eesptd:196	[Citation Analysis]
2009	Der Einfluss der Tarifbindung auf Lohnhöhe und Lohnverteilung RePEc:han:dpaper:dp-431	[Citation Analysis]
2009	How does entry regulation influence entry into self-employment and occupational mobility? RePEc:hum:wpaper:sfb649dp2009-034	[Citation Analysis]
2009	Measuring the Competitiveness of Selected CARICOM Countries: The Findings of the Global Competitiveness Index 2009-2010: Private Sector Development Discussion Paper #1 RePEc:idb:brikps:67058	[Citation Analysis]
2009	Intersection Bounds: estimation and inference RePEc:ifs:cemmap:19/09	[Citation Analysis]
2009	How does entry regulation influence entry into self-employment and occupational mobility? RePEc:ifs:ifsewp:09/14	[Citation Analysis]
2009	Innovation and Financial Globalisation RePEc:iis:dispap:iiisdp299	[Citation Analysis]
2009	How Does Entry Regulation Influence Entry into Self-Employment and Occupational Mobility? RePEc:iza:izadps:dp4221	[Citation Analysis]
2009	Unionization and the Evolution of the Wage Distribution in Sweden: 1968 to 2000 RePEc:iza:izadps:dp4246	[Citation Analysis]
2009	Family Networks and School Enrolment: Evidence from a Randomized Social Experiment RePEc:iza:izadps:dp4497	[Citation Analysis]
2009	Excess Turnover and Employment Growth: Firm and Match Heterogeneity RePEc:iza:izadps:dp4586	[Citation Analysis]
2009	When Supply Meets Demand: Wage Inequality in Portugal RePEc:iza:izadps:dp4592	[Citation Analysis]
2009	Local Human Capital Externalities and Wages at the Firm Level: The Case of Italian Manufacturing RePEc:iza:izadps:dp4613	[Citation Analysis]
2009	The Long and Short (of) Quality Ladders RePEc:nbr:nberwo:15178	[Citation Analysis]
2009	Financial Innovation and Endogenous Growth RePEc:nbr:nberwo:15356	[Citation Analysis]
2009	Import Competition and Quality Upgrading RePEc:nbr:nberwo:15503	[Citation Analysis]
2009	Quali percorsi per la finanza pubblica italiana? Primi elementi di discussione RePEc:pra:mprapa:17578	[Citation Analysis]
2009	Competition and Economic Growth: an Empirical Analysis for a Panel of 20 OECD Countries RePEc:pra:mprapa:20127	[Citation Analysis]
2009	How does competition affect the relationship between innovation and productivity? Estimation of a CDM model for Norway RePEc:pra:mprapa:27591	[Citation Analysis]
2009	Rationales and Instruments for Public Innovation Policies RePEc:rif:dpaper:1185	[Citation Analysis]
2009	Sources of Increased Wage Differentials in the Finnish Private Sector RePEc:rif:dpaper:1206	[Citation Analysis]
2009	Education, Productivity and Economic Growth: A Selective Review of the Evidence RePEc:sls:ipmsls:v:18:y:2009:1	[Citation Analysis]
2009	How does entry regulation influence entry into selfemployment and occupational mobility? RePEc:trf:wpaper:267	[Citation Analysis]
2009	Competition Policy and Productivity Growth: An Empirical Assessment RePEc:trf:wpaper:283	[Citation Analysis]
2009	Sequential Search with Incompletely Informed Consumers: Theory and Evidence from Retail Gasoline Markets RePEc:vie:viennp:0914	[Citation Analysis]
2009	Price Dispersion, Search Externalities, and the Digital Divide RePEc:vie:viennp:0916	[Citation Analysis]
2009	Big constraints to small firmsgrowth ? business environment and employment growth across firms RePEc:wbk:wbrwps:5032	[Citation Analysis]
2009	Competition policy and productivity growth: An empirical assessment RePEc:wzb:wzebiv:spii2009-12	[Citation Analysis]
2009	Stochern im Nebel: der Ungleichheit auf der Spur RePEc:zbw:wuewwb:104	[Citation Analysis]
2009	Of bubbles and bankers: The impact of financial booms on labor markets RePEc:zur:iewwpx:460	[Citation Analysis]

Recent citations received in: 2008

Year	Title	See
2008	The East German Wage Structure after Transition RePEc:ces:ceswps:_2511	[Citation Analysis]
2008	Unintended Consequences of Welfare Reform: The Case of Divorced Parents RePEc:cpr:ceprdp:7107	[Citation Analysis]
2008	Communication Can Destroy Common Learning RePEc:edn:esedps:184	[Citation Analysis]
2008	Do strong family ties inhibit trust? RePEc:ese:iserwp:2008-37	[Citation Analysis]
2008	Top incomes and earnings in Portugal 1936-2004 RePEc:hal:psewpa:halshs-00586795	[Citation Analysis]
2008	Marriage, Divorce and Interstate Risk Sharing RePEc:iza:izadps:dp3744	[Citation Analysis]
2008	Unintended Consequences of Welfare Reform: The Case of Divorced Parents RePEc:iza:izadps:dp3891	[Citation Analysis]
2008	An Assignment Model with Divorce and Remarriage RePEc:iza:izadps:dp3892	[Citation Analysis]
2008	Marriage, Divorce and Interstate Risk Sharing RePEc:jku:econwp:2008_16	[Citation Analysis]
2008	Marriage, Divorce and Interstate Risk Sharing RePEc:jku:nrnwps:2008_03	[Citation Analysis]
2008	Consumer protection and the incentive to become informed RePEc:pra:mprapa:9898	[Citation Analysis]
2008	Communication Can Destroy Common Learning RePEc:tor:tecipa:tecipa-330	[Citation Analysis]

Recent citations received in: 2007

Year	Title	See
2007	When Does FDI Have Positive Spillovers? Evidence from 17 Emerging Market Economies RePEc:cpr:ceprdp:6546	[Citation Analysis]
2007	Common Learning RePEc:cwl:cwldpp:1575r	[Citation Analysis]
2007	On Rate Optimality for Ill-posed Inverse Problems in Econometrics RePEc:cwl:cwldpp:1626	[Citation Analysis]
2007	Focused Power: Experimental Manifestation of the Shapley-Shubik Power Index RePEc:dkn:econwp:eco_2007_13	[Citation Analysis]
2007	When Does FDI Have Positive Spillovers? Evidence from 17 Emerging Market Economies RePEc:iza:izadps:dp3079	[Citation Analysis]
2007	Information and Human Capital Management RePEc:oxf:wpaper:367	[Citation Analysis]
2007	A Simple Nonparametric Estimator for the Distribution of Random Coefficients in Discrete Choice Models RePEc:pca:wpaper:36	[Citation Analysis]
2007	Common Learning RePEc:pen:papers:07-018	[Citation Analysis]

Warning!! This is still an experimental service. The results of this service should be interpreted with care, especially in research assessment exercises. The processing of documents is automatic. There still are errors and omissions in the identification of references. We are working to improve the software to increase the accuracy of the results.

Source data used to compute the impact factor of RePEc series.