Fritsch, Michael und Viktor Slavtchev: Industry Specialization, Diversity and the Efficiency of Regional Innovation Systems. In Cees van Beers, Alfred Kleinknecht, Roland Ortt and Robert Verburg (Hrsg.): Determinants of Innovative Behaviour: A Firm’s Internal Practices and its External Environment, Basingstoke 2008: Palgrave-MacMillan, 272-293. pdf