共 10 条
[8]
Using patents and publications to assess R&D efficiency in the states of the USA[J] . V.J. Thomas,Seema Sharma,Sudhir K. Jain.World Patent Information . 2010 (1)
[10]
Research, Innovation And Productivi[Ty: An Econometric Analysis At The Firm Level[J] . Bruno Crepon,Emmanuel Duguet,Jacques Mairessec.Economics of Innovation and New Technology . 1998 (2)