Hiroshi Yamamoto Shohei Uchiyama Maki Yamamoto Katsuichi Nakamura Katsuyuki Yamazaki Development of Sensor Network for Ecology Observation of Seabirds. 532-539 2012 95-D IEICE Transactions 2 http://search.ieice.org/bin/summary.php?id=e95-d_2_532 db/journals/ieicet/ieicet95d.html#YamamotoUYNY12