khan, Sarhad, et al. “ROLE OF CLEAN INTERMITTENT SELF CATHETERISATION (CISC) IN THE PREVENTION OF RECURRENT URETHRAL STRICTURES AFTER INTERNAL OPTICAL URETHROTOMY”. Journal of Ayub Medical College Abbottabad, vol. 23, no. 2, June 2011, pp. 22-25, https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/2524.