1. Burghardt E, Holzer E (1982) Minimal invasive cancer (microcarcinoma). Clin Oncol 1:313–645
2. Hermanek P (1982) Early stages of colorectal carcinoma: morphology, clinical aspects and prognosis. Clin Oncol 1:587–598
3. Grinnell RS, Lane N (1958) Benign and malignant adenomatous polyps and papillary adenomas of the colon and rectum. An analysis of 1856 tumours in 1335 patients. Surg Gynecol Obstet 106:519–538
4. Wolff WI, Shinya H (1975) Endoscopic polypectomy: therapeutic and clinicopathologic aspects. Cancer 36:683–690
5. Morson BC, Bussey HJR, Samoorian S (1977) Policy of local excision for early cancer of the colorectum. Gut 18:1045–1050