• Barbato, M., Bitto, A., Gray, R.H., Simpson, J.L., Queenan, J.T., Kambic, R.T., Perez, A., Mena, P., Pardo, F., Stevenson, W., Tagliabue, G., Jennings, V., & Li, C. (1997) "Effects of timing of conception on birth weight and preterm delivery of natural family planning users." Advances in Contraception 13 (2/3): 215-228.
     
  • Billings, E.L., & Billings, J.J. (1977) "Pregnancy investigation." International Review of Natural Family Planning 1 (1): 35-39.
     
  • Bitto, A., Gray, R.H., Simpson, J.L., Queenan, J.T., Kambic, R.T., Perez, A., Mena, P., Barbato, M., Li, C., & Jennings, V. (1997) "Adverse outcomes of planned and unplanned pregnancies among users of natural family planning: A prospective study." American Journal of Public Health 87 (3): 338-343.
     
  • Bracken, M.S. (1983/March) "Frequency of non-hormonal contraception around conception and association with congenital malformations in offspring." American Journal of Epidemiology 117 (3): 281-291.
     
  • Castilla, E.E., Lopez-Camelo, J.S., da Graca Dutra, M., Queenan, J.T., Simson, J.L., & NFP-ECLAMC Group. (1997) "The frequency and spectrum of congenital anomalies in natural family planning users in South America: No increase in a case-control study. Advances in Contraception 13 (4): 395-404.
     
  • Dewan, E.M. (1979/December) "On the possibility of a perfect rhythm method of birth control by periodic light stimulation." American Journal of Obstetrics and Gynecology 99: 1016-1019.
     
  • Fordney-Steelage, D. (1981) "A review of cervical mucus and sperm interactions in humans." International Journal of Fertility 26 (3): 161-169.
     
  • France, J.T., Graham, F.M., Gosling, L., Hair, P., & Knox, B.S. (1992) "Characteristics of natural conceptual cycles occurring in a prospective study of sex preselection: Fertility awareness symptoms, hormone levels, sperm survival, and pregnancy outcomes." International Journal of Fertility 37: 244-255.
     
  • Gray, R.H. (1984) "Aged gametes, adverse pregnancy outcomes and natural family planning: An epidemiologic review." Contraception 30 (4): 297-309.

    ________. (1991) "Natural family planning and sex selection: Fact or fiction?" American Journal of Obstetrics and Gynecology 165: 1982-1984.
     
  • Gray, R.H., & Kambic, R.T. (1988) "Epidemiological studies of natural family planning." Human Reproduction 3: 693-698.
     
  • Gray, R.H., Simpson, J.L., Bitto, A.C., Queenan, J.T., Li, C., Kambic, R.T., Perez, A., Mena, P., Barbato, M., Stevenson, W., & Jennings, V. (1998). "Sex ratio associated with timing of insemination and length of follicular phase in planned and unplanned pregnancies during use of natural family planning." Human Reproduction 13 (5): 1397-1400.
     
  • Guerrero, R., & Lanctot, D. (1970/May) "Aging of fertilizing gametes and spontaneous abortion: Effect of the day of ovulation and the time of insemination." American Journal of Obstetrics and Gynecology 107: 263-267.
     
  • Guerrero, R. (1978/November) "The aging of gametes: The known and the unknown." Linacre Quarterly 45 (4): 345-357.
     
  • Guerrero, V., & Guerrero, R. (1970) "Sex ratio: A statistical association with the type and time of insemination in the menstrual cycle." International Journal of Fertility 15: 221-225.
     
  • Hilgers, T.W. (1977/September) "The protection afforded by the cervical mucus in human reproduction." Bulletin National Family Planning Council Vict 4-12.
     
  • Jennings, V. (1992) "Major research issues in natural family planning." Advances in Contraception 8: 185.
     
  • Jochle, W. (1973/June) "Coitus-induced ovulation." Contraception 7: 523-564.
     
  • Jongbloet, P.H. (1985) "The aging gamete in relation to birth control failures and Down syndrome." European Journal of Pediatrics 144 (4): 343-347.
     
  • Kambic, R., Gray, R.H., & Simpson, J.L. (1988) "Aging gametes and NFP: What is currently known?" International Review of Natural Family Planning 12 (3): 226-249.
     
  • ________. (1989) "Outcome of pregnancy in users of natural family planning." International Journal of Gynecology and Obstetrics, 1 [supplement]: 99-110.
     
  • Kambic, R., & Gray, R.H. (1989) "Interobserver variation in estimation of day of conception intercourse using selected natural family planning charts." Fertility and Sterility 51: 430-434.
     
  • Klaus, H. (1981) "Natural family planning: A review." Obstetrical and Gynecological Survey 37 (2): 128-150.
     
  • Mancuso, S., Fulghesu, A.M., Di Simone, N., Riccardi, P., Vitale, E., Castellani, R., Bellante, F.P., & Lanzone, A. (1991) "Changes in fatty acids sebum composition during human menstrual cycle: Possible relationships with fertile period." Acta Europaea Fertilitatis 22: 43-45.
     
  • McCusker, M.P. (1982) "The subfertile couple." JOGN Nursing 11 (3): 157-162.
     
  • Mena, P., Bitto, A., Barbato, M., Perez, A., Gray, R.H., Simpson, J.L., Queenan, J.T., Kambic, R.T., Pardo, F., Stevenson, W., Tagliabue, G., Jennings, V., & Li, C. (1997) "Pregnancy complications in natural family planning users." Advances in Contraception 13 (2/3): 229-237.
     
  • Mettler, L. (1990) "Cervical factors in infertility." Current Opinion in Obstetrics & Gynecology 2: 193-199.
     
  • Nerbun, B., & Carter, P. (1982) "The scientific basis of the ovulation method of natural family planning." Bulletin of the South Carolina Academy of Science 44: 77.
     
  • Paulsen, C.A., Berman, N.G., & Wang, C. (1997) "Is male reproductive health at risk? Longitudinal semen analysis studies." Advances in Contraception 13 (2/3): 119-121.
     
  • Perez, A., Eger, R., Domenichini, V., Kambic, R., & Gray, R.H. (1985) "Sex ratio associated with natural family planning" [letter]. Fertility and Sterility 43 (1): 152-153.
     
  • Reame, N.E. (1992) "A prospective study of the menstrual cycle and spinal cord injury." American Journal of Physical Medicine and Rehabilitation 71: 15-21.
     
  • Roetzer, J. (1988) "Natural family planning and pregnancy outcome." International Journal of Fertility, 33 [supplement]: 40-42.
     
  • Simpson, J.L., Gray, R.H., Queenan, J.T., Mena, P., Perez, A., Kambic, R.T., Tagliabue, G., Pardo, F., Stevenson, W.S., Barbato, M. (1988) "Pregnancy outcome associated with natural family planning NFP scientific basis and experimental design for an international cohort study." Advances in Contraception 4: 247-264.
     
  • Simpson, J.L., Gray, R.H., Queenan, J.T., Kambic, R.T., Perez, A., Mena, P., Barbato, M., Pardo, F., Tagliabue, G., Bitto, A., Stevenson, W.S. (1991) "Fetal outcome among pregnancies in natural family planning acceptors: An international cohort study." American Journal of Obstetrics and Gynecology 165: 1981-1982. [Supplement 2 165-166].
     
  • Simpson, J.L., Gray, R.H., Perez, A., Mena, P., Barbato, M., Castilla, E.E., Kambic, R.T., Pardo, F., Tagliabue, G., Stephenson, W.S., Bitto, A., Li, C., Jennings, V.H., Spieler, J.M., & Queenan, J.T. (1997) "Pregnancy outcome in natural family planning users: Cohort and case-control studies evaluating safety." Advances in Contraception 13 (2/3): 201-214.
     
  • Simpson, J.L., Gray, R.H., Queenan, J.T., Barbato, M., Perez, A., Mena, P., Kambic, R.T., Pardo, F., Stevenson, W., Li, C., & Jennings, V. (1996) "Further evidence that infection is an infrequent cause of first trimester spontaneous abortion." Human Reproduction 11 (9): 2058-2060.
     
  • Simpson, J.T., Gray, R.L., Queenan, J.T., Kambic, R.T., Perez, A., Mena, P., Barbato, M., Pardo, F., Tagliabue, G., et al. (1992) "Assessing safety in natural family planning users." Advances in Contraception 8: 185-186.
     
  • Van Look, P.F.A., & Mancuso, S. (1989) "Natural fertility regulation today." International Journal of Gynecology and Obstetrics [supplement 1]: 1-167.
     
  • Vrbicky, K.W., Wells, I.C., Hilgers, T.W., Kable, W.T., Baumstark, J.S., & Elias, C.J. (1982) "Evidence for the involvement of beta-endorphin in the human menstrual cycle." Fertility and Sterility 38: 701-704.
     
  • Weinberg, C., Baird, D., & Wilcox, A. (1995) "The sex of the baby may be related to the length of the follicular phase in the conception cycle." Human Reproduction 10: 304-307.
     
  • Wilcox, A.J., Weinberg, C.R., & Baird, D.D. (1998) "Post-ovulatory aging of the human oocyte and embryo failure." Human Reproduction 13: 394-397.
     
  • World Health Organization. (1984) "A prospective multicenter study of the ovulation method of natural family planning IV: The outcome of pregnancy." Fertility and Sterility 41 (4): 593-598.

    ________. (1985) "A prospective multicenter study to develop universal immunochemical tests for predicting the fertile period in women." International Journal of Fertility 30 (3): 18-30.
     
  • Yudin, A.I., Hanson, F.W., & Katz, D.F. (1989) "Human cervical mucus and its interaction with sperm: A fine-structural view." Biology of Reproduction 40: 661-671.
     
  • Zarutskie, P.W., Muller, C.H., Magone, M., & Soules, M.R. (1989) "The clinical relevance of sex selection techniques." Fertility & Sterility 52: 891-905.
     
  • Zinaman, M.J., & Katz, D.F. (1997) "Incidence and implications of altered semen quality on family planning." Advances in Contraception 13 (2/3): 123-128.

 

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