Nugroho, M., Soesanto, A., Sukmawan, R., Kuncoro, A., Kusmana, D., Roebiono, P., Munawar, M. and Harimurti, G. (1) “Right Ventricular Function Assessment Using Speckle Tracking Method In Chronic Obstructive Pulmonary Disease”, Indonesian Journal of Cardiology, 31(3), pp. 156-64. doi: 10.30701/ijc.v31i3.127.