Long Thanh Ngo Long The Pham Phuong Hoang Nguyen Kaoru Hirota An Approach in Designing Hierarchy of Fuzzy Behaviors for Mobile Robot Navigation. 268-275 2007 11 JACIII 3 http://www.fujipress.jp/finder/xslt.php?mode=present&inputfile=JACII001100030002.xml db/journals/jaciii/jaciii11.html#NgoPNH07