論文（英文）
Simplified staging system for predicting the prognosis of patients with resectable liver metastasis: development and validation.
Minagawa, M, Yamamoto J, Kosuge T, Matsuyama Y, Miyagawa S, and Makuuchi M. Simplified staging system for predicting the prognosis of patients with resectable liver metastasis: Development and Validation. Archives of Surgery 2007; 142(3):269-276.