VERMA, V. K.; VIJAYAVARMAN, V. A case report on hyperpigmentation in vitamin B12 deficiency. International Journal of Research in Medical Sciences, [S. l.], v. 7, n. 5, p. 1944–1947, 2019. DOI: 10.18203/2320-6012.ijrms20191706. Disponível em: https://www.msjonline.org/index.php/ijrms/article/view/6228. Acesso em: 26 may. 2026.