CHOUDHRY, Z. A.; IQBAL, M. S.; LATIF, M.; HAMID, K. Comparison of Direct Trocar versus Veress Needle Insertion in Creation of Pneumoperitoneum in Patients Undergoing Laparoscopic Cholecystectomy. Annals of Punjab Medical College, v. 13, n. 2, p. 126-129, 19 Feb. 2019.