ALICI, Hakan, et al. “PYLOR PRESERVING PANCREATICODUODENECTOMY (PPPD): A CASE REPORT”. Turkish Journal of Gastroenterology, vol. 3, no. 2, Jan. 1992, pp. 399-02, https://www.turkjgastroenterol.org/index.php/tjg/article/view/93.