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Bart, Los ; Carolina, Castaldi ; Koen, Frenken ; Koen, Frenken ; Bart, Los. (2013) Related Variety, Unrelated Variety and Technological Breakthroughs: an analysis of U.S. state-level patenting.
In: Working Papers. RePEc:ein:tuecis:1303.

Full description at Econpapers

cites:

GRUPP, H. (1990) The concept of entropy in scientometrics and innovation research. An indicator for institutional involvement in scientific and technological developments, Scientometrics 18, 219-239 HALL, B.H., JAFFE, A.B. and TRAJTENBERG, M. (2002) The NBER patent-citations data file: lessons, insights, and methodological tools, in: Jaffe, A.B. and M. Trajtenberg, Patents, Citations & Innovations (Cambridge MA: MIT Press), 403-459.

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