INTERNATIONAL CONGRESS SERIES nr 375 , EXCERPTA MEDICA 529,241 Biological characterization of human tumours. Proceedings of the Sixth International Symposium on the Biological,,. Copenhagen,May 13-16,1975.Ed. Walter Davis, Cesare Maltoni. Linquistic ed. : P.R. J.Burch. Amsterdam 1976 Excerpta Medica; New York, American Elsevier Publ.Co.Inc. 8° s.VIII, nlb.2,424.il. Advances in Tumour Prevention Detection and Characterization vol.3 International Congress Ser. nr 375