Metastatic Malignant Melanoma of the Papilla of Vater: An Unusual Case of Obstructive Cholestasis Treated with Biliary Prostheses - Sans, M; Llach, J; Bordas, J M; Andreu, V; Campo, A; Castells, A; Mondelo, F; Terés, J; Rodés, J (Endoscopy, 1996)