1. A History of Surgery for Locally-Advanced (T4) Cancer of the Thoracic Esophagus in Japan and a Personal Perspective
   Hiromasa Fujita, 2013, Annals of Thoracic and Cardiovascular Surgery CrossRef
2. Tumor Staging of Advanced Esophageal Cancer: Combination of Double-Contrast Esophagography and Contrast-Enhanced CT
   Yuichiro Yamabe et al, 2008, American Journal of Roentgenology CrossRef