Westerhof, W., Bebelaar, D., Cormane, R., Langelaar, J. and Hup, J. (1981) “The protective role of epidermal melanin in a patient with porphyria variegata and vitiligo”, Acta Dermato-Venereologica, 61(1), pp. 23–28. doi: 10.2340/00015555612328.