Gurunluoglu, K., A. Tasci, H. Gozukara Bag, M. Demircan, and A. Sigirci. “When Is Free Air a Sign of Complication on Abdominal Plain Radiography After Laparotomy in Pediatric Patients?”. Annals of Medical Research, vol. 25, no. 3, May 2021, pp. 0410-5, http://annalsmedres.org/index.php/aomr/article/view/1464.