REFERENCES
- Borrman, A. Virchows Arch. path. Anal. 1927, 264, 700–729.
- Davies, J. & Neely, J. J. Path. Bad. 1972, 107, 265–270.
- Hafter, E. Praktische Gastroenetrologic, 5th Ed. Thieme Verlag, Stuttgart, 1973.
- Humphreys, S. R., Cameron, A. J. & Harrison, E. G. Gastroenterology 1972, 63, 1062–1065.
- Le Neel, J. C., Leborgne, J., Niybizi, D. & Vissct, J. Ann. Chir. 1972, 26, 167–171.
- Maurer, W., Thaler, G. A. & Miller, G. Med. et Hyg. (Genève) 1970, 28, 1336–1338.
- Michaelis, L. Brit. med. J. 1971, 3, 369–372.
- Mörl, F. K. & Stelzner, F. In Demling L. (ed.) Klinische Gastroenterologie, Vol. 1. 1st Ed. Thieme Verlag, Stuttgart, 1973.
- Owtschinnikow, P. J. Arch. klin. Chir. 1907, 83, 623–627.
- Rhoads, J. E. In Bockus H. L. (ed.) Gastroenterology, Vol. II. 2nd Ed. Saunders Company, Philadelphia - London 1964.
- Sickinger, K. Med. et Hyg. (Genève) 1969, 27, 93–98.
- Sabel, H. H., Schiffman, R. J., Schwarz, R. & Albert, W. S. Arch. Path. 1971, 91, 559–665.
- Villiger, K. & Deucher, F. Helv. chir. Acta 1966, 1/2, 322–331.