1. Brown, J. B., Blackwell, L. F., Cox, R. I., Holmes, J. M., and Smith, M. A. (1988) Chemical and Homogeneous Enzyme Immunoassay Methods for the Measurement of Estrogens and Pregnanediol and their Glucuronides in Urine.Prog.Biol. Clin. Res.285,119−138.
2. Natural family planning