Hitoshi Terai Hitomi Saito Yuka Egusa Masao Takaku Makiko Miwa Noriko Kando Differences between informational and transactional tasks in information seeking on the web. 152-159 2008 IIiX http://doi.acm.org/10.1145/1414694.1414728 conf/iiix/2008 db/conf/iiix/iiix2008.html#TeraiSETMK08