Ali, Qaisar, et al. “FREQUENCY OF PULMONARY HYPERTENSION IN PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE PRESENTING AT TERTIARY CARE HOSPITAL”. Insights – Journal of Health and Rehabilitation, vol. 3, no. 4, Mar. 2025, pp. 334-40, https://doi.org/10.71000/b5ky7h76.