Jingjing Liu Michael J. Cole Chang Liu Ralf Bierig Jacek Gwizdka Nicholas J. Belkin Jun Zhang Xiangmin Zhang Search behaviors in different task types. 69-78 2010 JCDL http://doi.acm.org/10.1145/1816123.1816134 conf/jcdl/2010 db/conf/jcdl/jcdl2010.html#LiuCLBGBZZ10