9Lager T, Horte S A. Success Factors for Improvement and Innovation of Process Technology in Process Industry [ J ]. Integrated Manufacturing Systems, 2002, 13 (3) : 158 - 164.
10Minasian J R. The Economics of Research and Develop- ment [M] //The Rate and Direction of Inventive Activity: Eco- nomic and Social Factors. NBER, 1962:93 - 142.
