Frattaroli, Fabrizio Maria, et al. “Assessment of Guidelines to Improve Diagnosis and Treatment of Solid Pseudopapillary Tumor of the Pancreas A Case Report and Literature Review”. Annali Italiani Di Chirurgia, vol. 80, no. 1, Jan. 2009, pp. 29-34, https://annaliitalianidichirurgia.it/index.php/aic/article/view/164.