nty,AcademicPress,1978.2.ElhannaHelpman,“InternationalTradeinthePresenceofProductDifferentiation,petition:AChamberlin-Hechscher-OhlinApproach”,JournalofInternationalEconomics11(1981),pp.305-340.3.ElhannaHelpman,“IncreasingReturns,ImperfectMarkets,andTradeTheory”,inRonaldW.JonesandPeterB.Kenen(eds.),HandbookofInternationalEconomics,Vol.1(Chapter7),pp.325-365,ElsevierSciencePublishersB.V.1984.4.ElhannaHelpman&PaulR.Krugman,MarketStructureandForeignTrade,TheMITPress,1985.5.ElhannaHelpman&PaulR.Krugman,TradePolicyandMarketStructure,TheMITPress,1989.6.GeneM.Grossman&ElhannaHelpman,InnovationandGrowthintheGlobalEconomy,TheMITPress,1991.7.GeneM.Grossman&ElhannaHelpman,“EndogenousInnovationintheTheoryofGrowth”,JournalofEconomicPerspectives,Vol.8(1),Winter1994,pp.23-44.(原文载于《经济学动态》2003年第7期,第89-93页)