Masafumi Yamashita Hideki Umemoto Ichiro Suzuki Tsunehiko Kameda Searching for Mobile Intruders in a Polygonal Region by a Group of Mobile Searchers. 208-236 2001 31 Algorithmica 2 http://link.springer.de/link/service/journals/00453/bibs/1031002/10310208.html db/journals/algorithmica/algorithmica31.html#YamashitaUSK01