Jongbloet, P. H. 1985. The Ageing Gamete in Relation to Birth Control Failures and Down Syndrome.
Jongbloet, P. H., A. J. M. Poestkoke, A. J. H. Hamers, and J. H. J. van Erkelens-Zwets. 1978. Down Syndrome and Religious Groups.
Jørgensen, N., A.-G. Andersen, F. Eustache, D. S. Irvine, J. Suominen, J. H. Petersen, J. Holm, A. N. Andersen, A. Nyboe, J. Auger, E. H. H. Cawood, A. Horte, T. K. Jensen, P. Jouannet, N. Keiding, M. Vierula, J. Toppari, and N. E. Skakkebaek. 2001. Regional Diferences in Semen Quality in Europe.
Jørgensen, N., M. Vierula, R. Jacobsen, E. Pukkala, A. Perheentupa, H. E. Virtanen, N. E. Skakkebaek, and J. Toppari. 2010. Recent Adverse Trends in Semen Quality and Testis Cancer Incidence Among Finnish Men.
Juberg, R. C. 1983. Origin of Chromosome Abnormalities: Evidence for Delayed Fertilization in Meiotic Nondisjunction.
Kaiser, I. H., and F. Halberg. 1962. Circadian Periodic Aspects of Birth.
Kakar, D. N., S. Chopra, S. A. Samuel, and K. Singar. 1989. Beliefs and Practices Related to Disposal of Human Placenta.
Kambic, R. T., and V. M. Lamprecht. 1996. Calendar Rhythm Effcacy: A Review.
Kang, J. H., F. Kondo, and Y. Katayama. 2006. Human Exposure to Bisphenol A.
Katz, G. 1953. The Seasonal Variation in the Incidence of Premature Deliveries.
Katzenberg, M. A., D. A. Herring, and S. R. Saunders. 1996. Weaning and Infant Mortality: Evaluating the Skeletal Evidence.
Kenagy, G. J., and S. C. Trombulak. 1986. Size and Function of Mammalian Testes in Relation to Body Size.
Kennedy, K. J., R. Rivera, and A. S. McNeilly. 1989. Consensus Statement on the Use of Breastfeeding as a Family Planning Method.
Kesserü, E. 1984. Sexual Intercourse Enhances the Success of Artificial Insemination.
Khatamee, M. A. 1988. Infertility: A Preventable Epidemic.
Kielan-Jaworowska, Z. 1979. Pelvic Structure and Nature of Reproduction in Multituberculata.
Kiltie, R. A. 1982. Intraspecific Variation in the Mammalian Gestation Period.
Kintner, H. J. 1985. Trends and Regional Diferences in Breastfeeding in Germany from 1871–1937.
Klaus, M. H. 1987. The Frequency of Suckling: A Neglected but Essential Ingredient of Breastfeeding.
Knodel, J. E. 1977. Breastfeeding and Population Growth: Assessing the Demographic Impact of Changing Infant Feeding Practices in the Third World.
Kobeissi, L., M. C. Inhorn, A. B. Hannoun, N. Hammoud, J. Awwad, and A. A. Abu-Musa. 2008. Civil War and Male Infertility in Lebanon.
Koletzko, B., E. Lien, C. Agostoni, H. Böhles, C. I. Campoy, T. Decsi, J. W. Dudenhausen, C. Dupont, S. Forsyth, I. Hoesli, W. Holzgreve, A. Lapillonne, G. Putet, N. J. Secher, M. Symonds, H. Szajewska, P. Willatts, and R. Uauy. 2008. The Roles of Long-Chain Polyunsaturated Fatty Acids in Pregnancy, Lactation, and Infancy: Review of Current Knowledge and Con-sensus Recommendations.
Konner, M., and C. Worthman. 1980. Nursing Frequency, Gonadal Function, and Birth Spacing Among! Kung Hunter-Gatherers.
Kovar, W. R., and R. J. Taylor. 1960. Is Spontaneous Abortion a Seasonal Problem?
Kramer, P. A. 1998. The Costs of Human Locomotion: Maternal Investment in Child Transport.
Kunz, G., H. Deininger, L. Wildt, and G. Leyendecker. 1996. The Dynamics of Rapid Sperm Transport Through the Female Genital Tract: Evidence from Vaginal Sonography of Uterine Peristalsis and Hysterosalpingoscintigraphy.
Kuruto-Niwa, R., Y. Tateoka, Y. Usuki, and R. Nozawa. 2007. Measurement of Bisphenol A Concentration in Human Colostrum.
Kuzawa, C. W. 1998. Adipose Tissue in Human Infancy and Childhood: An Evo-lutionary Perspective.
Labbok, M. H. 2001. Efects of Breastfeeding on the Mother [review].
Lam, D. A., and J. A. Miron. 1994. Global Patterns of Seasonal Variation in Hu-man Fertility.