共 28 条
[12]
Bound J., 1984, RD PATENTS PRODUCTIV
[15]
CORNISH WILLIAM., 2003, INTELLECTUAL PROPERT, V5th
[16]
EVANS D, 1989, J POLITICAL EC, V97, P519
[17]
FOREMANPECK JS, 1985, ECON HIST REV, V38, P402
[19]
Johnson P., 2007, EC SMALL FIRMS