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  • Billings, J.J. (1981) "Cervical mucus: The biological marker of fertility and infertility." International Journal of Fertility 26 (3): 182-195.
     
  • Bischof, P., Bianchi, P.G., Campana, A. (1991) "Comparison of a rapid, quantitative and automated assay for urinary luteinizing hormone (LH), with an LH detection test, for the prediction of ovulation." Human Reproduction 6: 515-518.
     
  • 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. (1977) "Timing of ovulation." Medical Journal of Australia 2: 780-783.
     
  • Brown, J.B., Blackwell, L.F., Holmes, J., Smyth, K. (1989) "New assays for identifying the fertile period." International Journal of Gynecology and Obstetrics 1 [supplement]: 111-122.
     
  • 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.
     
  • Burkhart, M.C., de Mazariegos, L., Salazar, S., Hess, T. (1999) "Incidence of irregular cycles among Mayan women who reported having regular cycles: implications for fertility awareness methods." Contraception 59: 271-275.
     
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  • Carranco, A., Reyes, R., Huacuja, L., Guzman, A., Delgado, N.M. (1992) "Human urinary glycosaminoglycans as accurate method for ovulation detection." International Journal of Fertility 37: 209-213.
     
  • Carter, R.L., Abrams, R.M., Moghissi, K.S. (1982) "A statistical approach to the determination of the fertile period." Gynecologic and Obstetric Investigation 13 (4): 226-234.
     
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  • Chiu, T.T., Tam, P.P., Mao, K.R. (1990) "Evaluation of a semiquantitative urinary LH assay for ovulation detection." International Journal of Fertility 35: 120-124.
     
  • 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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  • Cordone, A., Guida, M., Lampariello, C., Bruno, P., Montemagno, U. (1992) "Objective and subjective data for fertile period diagnosis in women comparison of methods." Clinical and Experimental Obstetrics & Gynecology 19: 15-24.
     
  • Daniel, J., Lonergan, P., Sullivan, P., Taylor, S. (1987) "Evaluation of Determine: The Ovutest as a device for identifying optimal time for conception." Fertility and Sterility 47 (4): 590.
     
  • deLauzon, S., Desfosses, B., Christeff, N., Hanquez, C., Cittanova, N. (1992) "A direct dot-enzyme immunoassay to detect human ovulation." Journal of Steroid Biochemistry & Molecular Biology 42: 223-228.
     
  • Direito, A., Bailly, S., Mariane, A., Ecochard, R. (2013) "Relationship between the luteinizing hormone surge and other characteristics of the menstrual cycle in normally ovulating women." Fertility and Sterility 99: 279-285.
     
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  • Dunson, D. B., Sinai, I., Colombo, B. (2001) "The relationship between cervical secretions and the daily probabilities of pregnancy: effectiveness of the TwoDay Algorithm." Human Reproduction 16: 2278-2282. 
     
  • Ecochard, R,. Boehringer, H., Rabilloud, M., Marret, H. (2001) "Chronological aspects of ultrasonic, hormonal, and other indirect indices of ovulation." British Journal of Obstetrics and Gynecology 108: 822-829.
     
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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. and Gaska, N. (1998) "Evaluation of the Lady Free biotester in determining the fertile period." Contraception 57 (5): 325-328.
     
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  • Fordney-Settlage, D. (1981) "A review of cervical mucus and sperm interactions in humans." International Journal of Fertility 26 (3): 161-169.
     
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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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  • Gregoriou, O., Kassanos, D., Vitoratos, N., Papadias, C., Zourlas, P.A. (1990) "Clinical efficacy of LH-color: A new home ovulation test." International Journal of Gynaecology & Obstetrics 32: 141-143.
     
  • 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.
     
  • Gudgeon, K., Leader, L., Howard, B. (1990) "Evaluation of the accuracy of the home ovulation detection kit, Clearplan, at prediction of ovulation." Medical Journal of Australia 152, 344, 346, 349.
     
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  • Hilgers, T.W. and Bailey, A.J. (1980) "Natural family planning II. Basal body temperature and estimated time of ovulation." Obstetrics and Gynecology 53 (3): 333-339.
     
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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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  • 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.
     
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  • Samples, J.T. and 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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  • 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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