Moreno, David F., et al. “Extramedullary Plasmacytoma Over the Scar from Long-Lasting Past Surgery As Presenting Feature of Multiple Myeloma”. Archives of Clinical and Biomedical Research, vol. 4, no. 6, Dec. 2020, pp. 766-74, https://fortunejournals.org/ojs/index.php/acbr/article/view/14808.