GEENEN J. /red./ 535,325 The papilla vateri and its diseases. International Workshop. /Ed. by/ M. Classen, J. Geenen, K. Kowai with ed. ass. by H. Colcher F. W. Ossenberg. Baden-Baden 1979 Verl. Gerhard Witzstrock 8 s. VIII, 151, il.