Product differentiation and product complexity : a conceptual model and an empirical application to microcomputers / Koen Frenken & Paul WindrumProduct differentiation and product complexity: a conceptual model and an empirical application to microcomputers / Koen Frenken, Paul WindrumUnderstanding product innovation using complex systems theory / Koen FrenkenTowards a European research area / Koen Frenken, Jarno Hoekman, Frank van Oort ; [ill, Jarno Hoekman ... et al.]Understanding product innovation using complex systems theory / Koen FrenkenA percolation model of the product lifecycle / Koen Frenken, Gerald Silverberg and Marco ValenteA percolation model of the product lifecycle / Koen Frenken, Gerald Silverberg and Marco Valente