1Richard C.Hoffman,W.Harvey Hegarty.Top management in-fluence on innovations:effects if executive characteristicsand social culture[J].Journal of Management,1993,Vol.19.No.3,549-574.
3Popp David,Ted Juhl and Daniel K.N.Johnson.Time inPurgatory:Determinants of the Grant Lag for U.S.Patent Ap-plications[J].NBER Working Paper,March 2003.