Mushtaq, Iqra, et al. “INDICATORS OF HEPATOPULMONAINDICATORS OF HEPATOPULMONARY SYNDROME IN PATIENTS WITH PORTAL HYPERTENSION”. Journal of Ayub Medical College Abbottabad, vol. 33, no. 1, Feb. 2021, pp. 14-19, https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/5361.