Munehiko Sasajima Yoshinobu Kitamura Takefumi Naganuma Shoji Kurakake Riichiro Mizoguchi OOPS: User Modeling Method for Task Oriented Mobile Internet Services. 771-775 2007 conf/webi/2007 Web Intelligence http://dx.doi.org/10.1109/WI.2007.4427187 db/conf/webi/webi2007.html#SasajimaKNKM07