D. K. Das, R. K. Patra, S. Mishra, and S. K. Panigrahi, “Ultrasound guided percutaneous catheter drainage of an appendicular perforation with large intraperitoneal abscess formation: an effective modality of management in selected cases”, Int Surg J, vol. 6, no. 6, pp. 2219–2221, May 2019.