Uddin, S. A., Rahman, M., Khan, M., Rahman, M. M., Islam, M., Ghose, S., Huda, M., Begum, S., Basak, P., & Rahman, M. T. (2018). A Study of Echocardiographic Changes Among the Patients of COPD. TAJ: Journal of Teachers Association, 28(1), 16–20. https://doi.org/10.3329/taj.v28i1.39062