Welfens, P.J.J.P.J.J.WelfensAddison, J.J.AddisonAudretsch, D.D.AudretschGrupp, H.H.Grupp2022-03-072022-03-071997https://publica.fraunhofer.de/handle/publica/289219de303600Research and Development (R&D) Policy and Employmentbook