“Validity of Estimation of Pulmonary Artery Pressure Using Continuous Wave Doppler Echocardiography in Patient With Patent Ductus Arteriosus (PDA)”. University Heart Journal 7, no. 1 (March 29, 2012): 10–12. Accessed July 3, 2026. https://banglajol.info/index.php/UHJ/article/view/10202.