Singh Yadav, A. K., B. P., P., A. C., G., Singh, M., Verma, A. K. and Gupta, V. (2017) “Comparison of endoscopic variceal ligation and beta-blocker (carvedilol) plus nitrate for the primary prevention of variceal bleeding”, International Journal of Advances in Medicine, 4(4), pp. 1053–1058. doi: 10.18203/2349-3933.ijam20173230.