Miroux-Catarino, A., L. Silva, M. G. Catorze, and I. Viana. “A Case of Acquired Mucosal and Cutaneous Pigmentation”. Journal of the Portuguese Society of Dermatology and Venereology, Vol. 77, no. 3, Oct. 2019, pp. 267-9, doi:10.29021/spdv.77.3.1095.