Guerriero, G (aprilie 2009). „Vertebrate sex steroid receptors: evolution, ligands, and neurodistribution”. Annals of the New York Academy of Sciences. 1163: 154–68. doi:10.1111/j.1749-6632.2009.04460.x. PMID19456336.
ElAttar, TM; Hugoson, A (). „Comparative metabolism of female sex steroids in normal and chronically inflamed gingiva of the dog”. Journal of Periodontal Research. 9 (5): 284–9. doi:10.1111/j.1600-0765.1974.tb00683.x. PMID4281823.
Guerriero, G (aprilie 2009). „Vertebrate sex steroid receptors: evolution, ligands, and neurodistribution”. Annals of the New York Academy of Sciences. 1163: 154–68. doi:10.1111/j.1749-6632.2009.04460.x. PMID19456336.
ElAttar, TM; Hugoson, A (). „Comparative metabolism of female sex steroids in normal and chronically inflamed gingiva of the dog”. Journal of Periodontal Research. 9 (5): 284–9. doi:10.1111/j.1600-0765.1974.tb00683.x. PMID4281823.