^Bhavnani BR, Nisker JA, Martin J, Aletebi F, Watson L, Milne JK. Comparison of pharmacokinetics of a conjugated equine estrogen preparation (premarin) and a synthetic mixture of estrogens (C.E.S.) in postmenopausal women. Journal of the Society for Gynecologic Investigation. 2000, 7 (3): 175–83. PMID 10865186. doi:10.1016/s1071-5576(00)00049-6.