K. Das, M. Ozdogan, F. Karateke, A. S. Uzun, S. Sozen, and S. Ozdas, “Comparison of APACHE II, P-POSSUM and SAPS II scoring systems in patients underwent planned laparotomies due to secondary peritonitis”, Ann Ital Chir, vol. 85, no. 1, pp. 16–21, Jan. 2014.