1. Edmondson HA (1958) Tumor of the liver and intrahepatic bile ducts. Armed forces Institute of Pathology, Washington, DC, pp 32?105
2. Foster JH (1984) Computing operative risk, editorial. Surgery 95:631
3. Hermanek P, Sobin LH for the International Union Against Cancer (UICC) (1987) TNM Classification of malignant tumors. 4th edn. Springer, Berlin Heidelberg New York, pp 53?55
4. Hsu HC, Wu TT, Wu MZ, Sheu JC, Lee CZ, Chen DS (1988) Tumour invasiveness and prognosis in resected hepatocellular carcinoma: clinical and pathogenic implication. Cancer 61:2095?2099
5. Huguet C, Bona S, Nordlinger B, Lagrange L, Parc R, Harb J, Benard F (1990) Repeat hepatic resection for primary and metastatic carcinoma of the liver. Surg Gynecol Obstet 171:398?402