Atsushi Nishikawa Toshinori Hosoi Kengo Koara Daiji Negoro Ayae Hikita Shuichi Asano Fumio Miyazaki Mitsugu Sekimoto Yasuhiro Miyake Masayoshi Yasui Morito Monden Real-Time Visual Tracking of the Surgeon's Face for Laparoscopic Surgery. 9-16 2001 conf/miccai/2001 MICCAI http://link.springer.de/link/service/series/0558/bibs/2208/22080009.htm db/conf/miccai/miccai2001.html#NishikawaHKNHAMSMYM01