Cook, C. E., Kepler, J. A., Chung, N. M., Kimmel, G. A., Tallent, C. R., & Petrow, V. M. (1978). Synthesis and activity (post-coital antifertility and hormonal) of 2,7α-dimethyl steroids. Journal of Steroid Biochemistry, 9(9), 813. https://doi.org/10.1016/0022-4731(78)90705-7

Cook, C. E., J. A. Kepler, N. M. Chung, G. A. Kimmel, C. R. Tallent, and V. M. Petrow. “Synthesis and activity (post-coital antifertility and hormonal) of 2,7α-dimethyl steroids.” Journal of Steroid Biochemistry 9, no. 9 (January 1, 1978): 813. https://doi.org/10.1016/0022-4731(78)90705-7.

Cook CE, Kepler JA, Chung NM, Kimmel GA, Tallent CR, Petrow VM. Synthesis and activity (post-coital antifertility and hormonal) of 2,7α-dimethyl steroids. Journal of Steroid Biochemistry. 1978 Jan 1;9(9):813.

Cook, C. E., et al. “Synthesis and activity (post-coital antifertility and hormonal) of 2,7α-dimethyl steroids.” Journal of Steroid Biochemistry, vol. 9, no. 9, Jan. 1978, p. 813. Scopus, doi:10.1016/0022-4731(78)90705-7.

Cook CE, Kepler JA, Chung NM, Kimmel GA, Tallent CR, Petrow VM. Synthesis and activity (post-coital antifertility and hormonal) of 2,7α-dimethyl steroids. Journal of Steroid Biochemistry. 1978 Jan 1;9(9):813.