Qureshi, Shakeel Ahmed, Masud Ur Rehman Kiani, S Afzal Ahmed, and M.Zulfiqar Ali Khan. “Non-Invasive Estimation of Mean Pulmonary Artery Pressure Using Pulsed Doppler Echocardiography (P.D.E)”. Pakistan Heart Journal 18, no. 2 (October 1, 2012). Accessed November 24, 2024. https://pakheartjournal1.pcs.org.pk/index.php/pk/article/view/391.