Chen Wang Sujian Li Wei Wang 0013 Experiment Research on Feature Selection and Learning Method in Keyphrase Extraction. 305-312 2009 ICCPOL http://dx.doi.org/10.1007/978-3-642-00831-3_29 conf/iccpol/2009 db/conf/iccpol/iccpol2009.html#WangLW09