Discussion paper DP8579 Industries at the World Technology Frontier: Measuring R&D Efficiency in a Non-Parametric DEA Framework Jens Schmidt-Ehmcke Petra Zloczysti 1 Sep 2011 Industrial Organization C14 L60 O31 O57
Discussion paper DP8047 R&D Efficiency and Barriers to Entry: A Two Stage Semi-Parametric DEA Approach Jens Schmidt-Ehmcke Astrid Cullmann Petra Zloczysti 23 Oct 2010 Industrial Organization C14 C24 L50 O31 O57
Discussion paper DP7865 Innovative Activity in Wind and Solar Technology: Empirical Evidence on Knowledge Spillovers Using Patent Data Jens Schmidt-Ehmcke Petra Zloczysti Frauke G Braun 1 Jun 2010 Industrial Organization O31 Q42 Q55