Cavallaro, Andrea, et al. “Giant Retroperitoneal Tumors: A 13.5 Kg Liposarcoma Case Report”. Annali Italiani Di Chirurgia, vol. 78, no. 6, Nov. 2007, pp. 515-9, https://annaliitalianidichirurgia.it/index.php/aic/article/view/2482.