Lin AN, Reimer RJ, Carter DM (March 1988). "Sulfur revisited". Journal of the American Academy of Dermatology. 18 (3): 553–8. doi:10.1016/S0190-9622(88)70079-1. PMID2450900.
Lin AN, Reimer RJ, Carter DM (March 1988). "Sulfur revisited". Journal of the American Academy of Dermatology. 18 (3): 553–8. doi:10.1016/S0190-9622(88)70079-1. PMID2450900.