Pansini, G.; Lanzara, S.; Feo, C.; Zamboni, P.; Liboni, A.; Ambrosio, M.; Marzola, A.; Feggi, L. MALIGNANCY: TREATMENT AND PROGNOSIS OF ENDOCRINE TUMOURS OF GASTROINTESTINAL TRACT AND PANCREAS: A RETROSPECTIVE STUDY ABOUT 16 CASES. Ann Ital Chir 2001, 72, 413-422.