Zheng Liu Marcelo H. Ang Jr. Winston Khoon Guan Seah A Searching and Tracking Framework for Multi-Robot Observation of Multiple Moving Targets. 14-22 2004 8 JACIII 1 http://www.fujipress.jp/finder/xslt.php?mode=present&inputfile=JACII000800010003.xml db/journals/jaciii/jaciii8.html#LiuAS04