Filippou, Dimitrios K., et al. “A Rare Case of Ectopic Pancreas in the Ampulla of Vater Presented With Obstructive Jaundice”. Annali Italiani Di Chirurgia, vol. 77, no. 6, Nov. 2006, pp. 517-9, https://annaliitalianidichirurgia.it/index.php/aic/article/view/3068.