Forms of knowledge and modes of innovation Morten Berg Jensen; Björn Johnson; Edward Lorenz; Bengt-Åke Lundvall Research Policy 2007 36(5), 680-693
National systems of production, innovation and competence building Bengt-Åke Lundvall; Björn Johnson; Esben Sloth Andersen; Bent Dalum Research Policy 2002 31(2), 213-231