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An overview of the pharmacology and pharmacokinetics of the newer generation aromatase inhibitors anastrozole, letrozole, and exemestane. Cancer. November 2002, 95 (9): 2006–16. PMID 12404296. doi:10.1002/cncr.10908.
Sources of estrogen and their importance. The Journal of Steroid Biochemistry and Molecular Biology. September 2003, 86 (3–5): 225–30. PMID 14623515. doi:10.1016/S0960-0760(03)00360-1.