Agarwal, R., D. Lahiri, R. Baid, and J. Mukhopadhyay. “A Rare Cause of Bleeding Gastric Ulcer: Multiple Myeloma”. International Journal of Research in Medical Sciences, vol. 3, no. 1, Jan. 2017, pp. 317-9, https://www.msjonline.org/index.php/ijrms/article/view/1262.