RT Article T1 Firm strategies and trends in patent litigation in the United States JF Advances in the study of entrepreneurship, innovation, and economic growth VO 15 SP 103 OP 147 A1 Somaya, Deepak LA English YR 2004 UL https://krimdok.uni-tuebingen.de/Record/1912560607 DO 10.1016/S1048-4736(04)01504-8