Safdar, Lt Col Chaudhry Aqeel, et al. “FREQUENCY OF CONTRALATERAL PATENT PROCESSUS VAGINALIS IN CHILDREN PRESENTING WITH UNILATERAL HERNIAS: Patent Processus Vaginalis”. Pakistan Armed Forces Medical Journal, vol. 60, no. 1, Mar. 2010, pp. 69-72, https://www.pafmj.org/PAFMJ/article/view/221.