共 4 条
[3]
知识产权战略[M]. 科学出版社 , 陈昌柏著, 1999
[4]
R&D and the Patent Premium. Camegie MellonUniversity .2 Aror A,Ceccagnoli M,Cohen W. http://papers-nber9.nber.org/papers/w9431 . 2001