Takahisa Matsuda, Yutaka Saito, Takeshi Nakajima, Taku Sakamoto, Hiroaki Ikematsu, Yasushi Sano, Kuang-I Fu, Takahiro Fujii, Macroscopic estimation of submucosal invasion in the colon, Techniques in Gastrointestinal Endoscopy, Volume 13, Issue 1, 24-32, January 2011.