. . "Gastrointestinal Neoplasms Congresses." . . "Tube digestif Tumeurs Congrès." . . . "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, April 14-15, 1977, held at the Institut Jules Bordet, Cancer Center of the University of Brussels, Belgium" . . "Conference papers and proceedings" . . "Conference proceedings" . . . . . . . . .