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  • Baird, D.D., Weinberg, C.R., Wilcox, A.J., McConnaughey, D.R., & Musey, P.I. (1991) "Using the ratio of urinary estrogen and progesterone metabolites to estimate day of ovulation." Statistics in Medicine 10: 255-266.
     
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  • Blackwell, L.F., Brown, J.B., Cooke, D. (1998) "Definition of the potentially fertile period from urinary steroid excretion rates. Part II. A threshold value for pregnanediol glucuronide as a marker for the end of the potentially fertile period in the human menstrual cycle." Steroids 63: 5-13.
     
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  • ________. (2013) "Monitoring of ovarian activity by measurement of urinary excretion rates of estrone glucuronide and pregnanediol glucuronide using the Ovarian Monitor, Part III: variability of the normal menstrual cycle profiles." Human Reproduction 28: 3306-3315.
     
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  • Brown, J.B., Holmes, J., & Barker, G. (1991) "Use of the home ovarian monitor in pregnancy avoidance." American Journal of Obstetrics and Gynecology 165: 2008-2011.
     
  • Burger, H.G. (1981) "Neuroendocrine control of human ovulation." International Journal of Fertility 26: 153-160.
     
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  • Collins, W.P. (1989) "Biochemical indices of potential fertility." International Journal of Gynecology & Obstetrics 1 [supplement]: 35-43.

    ________. (1991) "The evolution of reference methods to monitor ovulation." American Journal of Obstetrics & Gynecology 165: 1994-1996.
     
  • Collins, W.P., Branch, C.M., Collins, P.O., & Sallam, H.N. (1981) "Biochemical indices of the fertile period in women." International Journal of Fertility 26 (3): 345-350.
     
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  • Ecochard, R., Leiva, R., Bouchard, T., Boehringer, H., Direito, A,. Mariani, R. and Fehring, R. (2013) "Use of urinary Pregnanediol 3-Glucuronide to confirm ovulation." Steroids 78: 1035-1040.
     
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  • Fehring, R.J. (1990) "Methods to self-predict ovulation: A comparative study." Journal of Obstetric, Gynecologic & Neonatal Nursing 19: 233-237.

    ________. (1991) "New technology in natural family planning." Journal of Obstetric, Gynecologic, and Neonatal Nursing 20: 199-205.

    ________. (1996) "A comparison of the ovulation method with the Cue ovulation predictor in determining the fertile period." Journal of the American Academy of Nurse Practitioners 8 (10): 461-466.
     
  • Fehring, R.J., & Gaska, N. (1998) "Evaluation of the Lady Free biotester in determining the fertile period." Contraception 57 (5): 325-328.
     
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  • France, J.T. (1981) "Overview of the biological aspects of the fertile period." International Journal of Fertility 26 (3): 143-152.
     
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  • Gross, B.A. (1987) "Natural family planning indicators of ovulation." Clinical Reproduction and Fertility 5: 91-117.

    ________. (1989) "Clinical indicators of the fertile period." International Journal of Gynecology & Obstetrics 1 [supplement]: 45-51.
     
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  • Hilgers, T.W., Daly, D., Prebil, A.M., & Hilgers, S.K. (1981) "Natural family planning III. Intermenstrual symptoms and estimated time of ovulation." Obstetrics and Gynecology 58 (2): 152-155.
     
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  • Perez, A. (1981) "Natural family planning: Postpartum period." International Journal of Fertility 26 (3): 219-221.
     
  • Quaglearello, J., & Arny, M. (1986/March) "Inaccuracy of basal body temperature charts in prediction urinary luteinizing hormone surges." Fertility and Sterility 46: 334-347.
     
  • Rodriquez, M.H., Mishell, D.R., Jr., Grozinger, C., Cao, J.N., & Lacarra, M. (1990) "Comparison of TestPack and Ovustick for predicting ovulation." Journal of Reproductive Medicine 35: 133-135.
     
  • Rohr, G., Eggert-Krause, W., Pehlke, A., Sahrbacher, U., Runnebaum, B., & Kalbitzer, H.R. (1992) "Biochemical analysis of cervical mucus by nuclear magnetic resonance spectroscopy." Human Reproduction 7: 915-917.
     
  • Roumen, F., & Dieben, T. (1988) "Ovulation prediction by monitoring salivary and vaginal electrical resistance pattern: Implications for natural family planning." Obstetrics and Gynecology 71 (1): 49-52.
     
  • Royston, J.P., & Abrams, R.M. (1980) "An objective method for detecting the shift in basal body temperature in women." Biometrics 36 (2): 217-224.
     
  • Royston, J.P., Abrams, R.M., Higgins, M.P., & Flynn, A.W. (1980) "The adjustment of basal body temperature measurements to allow for time of waking." British Journal of Obstetrics and Gynaecology 87 (12): 1123-1127.
     
  • Royston, J.P., Humphrey, S.J., Flynn, A.M., Marshall, J., & Zarzosa-Periz, A. (1984) "An automatic electronic device (Rite Time) to detect the onset of the infertile period by basal body temperature measurements." British Journal of Obstetrics and Gynaecology 91 (6): 565-573.
     
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  • Rudy, E.B., & Estok, P. (1992) "Professional and lay interrater reliability of urinary luteinizing hormone surges measured by OvuQuick test." Journal of Obstetric, Gynecologic, & Neonatal Nursing 21: 407-411.
     
  • Samples, J.T., & Abrams, R.M. (1984) "Reliability of urine temperature as a measurement of basal body temperature." JOGN Nursing 13 (5): 319-323.
     
  • Sans, L.J. (1977) "Ovulation symptoms and ovarian function in blind women." Fertility and Sterility 28 (3): 277-278.
     
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  • Schenker, J.G., & Weimanm, J. (1983) "Changes in the electrical impedance of the vaginal wall as a method for natural family planning." Contraceptive Delivery Systems 4 (4).
     
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  • Seif, M.W., Aplin, J.D., Foden, L.J., & Tindall, V.R. (1989) "A novel approach for monitoring the endometrial cycle and detecting ovulation." American Journal of Obstetrics & Gynecology 160: 357-362.
     
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  • Sondheimer, S.J. (1986) "Cervical mucus and contraception." Seminars in Reproductive Endocrinology 4: 282-386.
     
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  • Usala, S.J., & Schumacher, G.F.B. (1983) "Volumetric self sampling of cervico-vaginal fluid: A new approach to ovulation timing." Fertility and Sterility 39 (3): 304-309.
     
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