REFERENCES
- Crespi, M., Gigotti, G. & Di Mattco, S. pp. 227–229 in Marcozzi, G. & Crespi, M., (eds.) Proceedings of the 2nd World Congress of Gastrointestinal Endoscopy. Piccin Medical Books, Padua, 1970
- Crespi, M. pp. 81–82 in Maltoni, C. (ed.) International Congress Series No 322, Cancer Detection and Prevention. Excerpta Medica, Amsterdam, 1973
- Liavåg, I., Marcussen, J. & Serck-Hanssen, A. Acta Chir. Scand. 1971, 137, 682–688
- Myren, J. & Reichborn-Kjennerud, S. Scand. J. Gastroent. 1971, 6, 385–387
- Seppälä, K. Acta Med. Scand. 1961, 169, Suppl 363
- Seppälä, K. Scand. J. Gastroent. 1973, 8, 529–531
- Vilardell, F. pp. 129–156 in Glass, G. B. J. (ed.) Progress in Gastroenterology, vol. I. Grune & Stratton, New York and London, 1968