Eliahu Levitas, Eliahu & Lunenfeld, Eitan & Weiss, Noemi & Friger, Michael & Har-Vardi, Iris & Koifman, Arie & Potashnik, Gad: Relationship between the duration of sexual abstinence and semen quality: analysis of 9,489 semen samples. Fertility and Sterility, 2005, 83. vsk, nro 6. American Society for Reproductive Medicine. doi:10.1016/j.fertnstert.2004.12.045Artikkelin verkkoversio. Viitattu 24.7.2018.
T. K. Jensen, M. Vierula, N. H. Hjollund, M. Saaranen, T. Scheike, S. Saarikoski: Semen quality among Danish and Finnish men attempting to conceive. The Danish First Pregnancy Planner Study Team. European Journal of Endocrinology, 2000-01, 142. vsk, nro 1, s. 47–52. PubMed:10633221doi:10.1530/eje.0.1420047ISSN 0804-4643Artikkelin verkkoversio.
Eliahu Levitas, Eliahu & Lunenfeld, Eitan & Weiss, Noemi & Friger, Michael & Har-Vardi, Iris & Koifman, Arie & Potashnik, Gad: Relationship between the duration of sexual abstinence and semen quality: analysis of 9,489 semen samples. Fertility and Sterility, 2005, 83. vsk, nro 6. American Society for Reproductive Medicine. doi:10.1016/j.fertnstert.2004.12.045Artikkelin verkkoversio. Viitattu 24.7.2018.
T. K. Jensen, M. Vierula, N. H. Hjollund, M. Saaranen, T. Scheike, S. Saarikoski: Semen quality among Danish and Finnish men attempting to conceive. The Danish First Pregnancy Planner Study Team. European Journal of Endocrinology, 2000-01, 142. vsk, nro 1, s. 47–52. PubMed:10633221doi:10.1530/eje.0.1420047ISSN 0804-4643Artikkelin verkkoversio.
T. K. Jensen, M. Vierula, N. H. Hjollund, M. Saaranen, T. Scheike, S. Saarikoski: Semen quality among Danish and Finnish men attempting to conceive. The Danish First Pregnancy Planner Study Team. European Journal of Endocrinology, 2000-01, 142. vsk, nro 1, s. 47–52. PubMed:10633221doi:10.1530/eje.0.1420047ISSN 0804-4643Artikkelin verkkoversio.