3Jean O Lanjouw, Mark Schankerman. Patent Quality and Research Productivity : Measuring Innovation with Multiple Indicators [J]. The Economic Journal,2004,114(495) : 441-465.
4Erdi P,Makovi K,Somogyvari Z. Prediction of Emerging Technologies Based on Analysis of the US Patent Citation Network [J]. Scientometrics,2013,95(1 ) :225-242.