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Our data says that the document:

Patrick, Llerena ; Valentine, Millot ; Patrick, Llerena. (2013) Are Trade Marks and Patents Complementary or Substitute Protections for Innovation..
In: Working Papers of BETA. RePEc:ulp:sbbeta:2013-01.

Full description at Econpapers

cites:

Griliches, Z., 1991, Patent Statistics as Economic Indicators: A Survey, NBER Working Papers 3301, National Bureau of Economic Research, Inc.

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