Disa, Joseph J.; Vossoughi, Jafar; Goldberg, Nelson H. (Oktober 1993). »A comparison of obsidian and surgical steel scalpel wound healing in rats«. Plastic and reconstructive surgery. 92 (5): 884–887. doi:10.1097/00006534-199392050-00015. PMID8415970.
Disa, Joseph J.; Vossoughi, Jafar; Goldberg, Nelson H. (Oktober 1993). »A comparison of obsidian and surgical steel scalpel wound healing in rats«. Plastic and reconstructive surgery. 92 (5): 884–887. doi:10.1097/00006534-199392050-00015. PMID8415970.