David Kirk Evans Lun-Wei Ku Yohei Seki Hsin-Hsi Chen Noriko Kando Opinion Analysis Across Languages: An Overview of and Observations from the NTCIR6 Opinion Analysis Pilot Task. 456-463 2007 conf/wilf/2007 WILF http://dx.doi.org/10.1007/978-3-540-73400-0_57 db/conf/wilf/wilf2007.html#EvansKSCK07