Inventive progress measured by multi-stage patent citation analysis

Research Policy - Tập 34 - Trang 1591-1607 - 2005
Iwan von Wartburg1, Thorsten Teichert1, Katja Rost2
1University of Hamburg, Marketing and Innovation, Von-Melle-Park 5, D-20146 Hamburg, Germany
2University of Zurich, Switzerland

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