Nugroho, Mochamad, Amiliana Soesanto, Renan Sukmawan, Aryo Kuncoro, Dewiana Kusmana, Poppy Roebiono, M Munawar, and Ganesja Harimurti. “Right Ventricular Function Assessment Using Speckle Tracking Method In Chronic Obstructive Pulmonary Disease”. Indonesian Journal of Cardiology 31, no. 3 (1): 156-64. Accessed April 16, 2021. https://ijconline.id/index.php/ijc/article/view/127.