Mufti, Tariq, et al. “A PROSPECTIVE SUTDY OF ETIOLOGICAL FACTORS IN NONDEFLATABLE FOLEY’S URETHRAL CATHETERS AND EVALUATION OF A DEFLATION TECHNIQUE”. Journal of Ayub Medical College Abbottabad, vol. 1, no. 1, Feb. 1988, pp. 22-24, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/4611.