Varela Vega, M., G. Larrosa, and A. De Martini. “Emphysematous Cholecystitis in the Ptotic Gallbladder”. Revista Argentina De Cirugía, vol. 110, no. 2, Mar. 2021, p. 117, https://revista.aac.org.ar/index.php/RevArgentCirug/article/view/163.