Nafees, Syed Shahid, et al. “EXPERIENCE OF FONTAN SURGERY AT ARMED FORCES INSTITUTE OF CARDIOLOGY NATIONAL INSTITUTE OF HEART DISEASES (AFIC-NIHD)”. Pakistan Armed Forces Medical Journal, vol. 61, no. 2, June 2011, pp. 160-63, https://pafmj.org/PAFMJ/article/view/162.