V. N. Klimenko, D. V. Syvolap, S. M. Kravchenko, A. V. Zakharchuk, and V. V. Vakulenko, “Comparative analysis of the postoperative period after laparoscopic cholecystectomy and minimal laparotomical access”, Zaporozhye Medical Journal, vol. 16, no. 2, Jun. 2014.