196,098 GASTROINTESTINAL Gastrointestinal tumours: a clinical and experimental approach. Proceedings of an International Symposium Sponsored by the European Organization for Research and Treatment of Cancer (E. O. R. T. C.), Brussels, 14-15 April, 1977, held at the Institut Jules Bordet, Cancer Center of the University of Brussels, Belgium. Ed. A. Gerard. Oxford 1978 Pergamon Press 4 s. VI, 202,il.