Zollinger RM, Ellison EH (1955). «Primary peptic ulcerations of the jejunum associated with islet cell tumors of the pancreas». Ann. Surg. 142 (4): 709–23; discussion, 724–8. PMID13259432. doi:10.1097/00000658-195510000-00015
Zollinger RM, Ellison EH (1955). «Primary peptic ulcerations of the jejunum associated with islet cell tumors of the pancreas». Ann. Surg. 142 (4): 709–23; discussion, 724–8. PMID13259432. doi:10.1097/00000658-195510000-00015