5Ernst H.. Patent information for strategic technology management [ J ]. World Patent Information,2003, (25) :233 -243.
6Ramani S. V. , de Looze M. A.. Using patent statistics as knowledge base indicators in the biotechnology sectors : An application to France, Germany and theUK [ J ]. Scientometrics, 2002,54 ( 3 ) : 319 - 346.
