Deschamps, Lydia, et al. “Mixed Endocrine Somatostatinoma of the Ampulla of Vater Associated With a Neurofibromatosis Type 1: A Case Report and Review of the Literature”. JOP. Journal of the Pancreas, vol. 11, no. 1, July 2016, pp. 64-68, doi:10.6092/1590-8577/3875.