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28. Natural family planning: a birth control alternative. Matis N. J Nurse Midwifery; 1983 Dec; 28(1):7-16. PubMed ID: 6551435 [Abstract] [Full Text] [Related]
29. [The 1st phase of a prospective study of the effectiveness of natural family planning conducted in French-speaking Belgium]. De Leizaola MA. J Gynecol Obstet Biol Reprod (Paris); 1994 Dec; 23(4):359-64. PubMed ID: 8051361 [Abstract] [Full Text] [Related]
31. Natural family planning. I. The peak symptom and estimated time of ovulation. Hilgers TW, Abraham GE, Cavanagh D. Obstet Gynecol; 1978 Nov; 52(5):575-82. PubMed ID: 724176 [Abstract] [Full Text] [Related]
32. [The present state of utilization of NFP techniques (fertility awareness methods)]. Murayama S, Hashimoto T, Saito T, Shimizu K, Saito K, Nozawa T, Suda Y. Nihon Funin Gakkai Zasshi; 1987 Jan; 32(1):65-71. PubMed ID: 12158556 [Abstract] [Full Text] [Related]
34. Natural family planning in 1985: a status report. Spieler J, Shuler A. Popul Today; 1985 May; 13(5):3, 9. PubMed ID: 12280130 [Abstract] [Full Text] [Related]
35. Fertility awareness / natural family planning for adolescents and their families: report of multisite pilot project. Klaus H, Bryan LM, Bryant ML, Fagan MU, Harrigan MB, Kearns F. Int J Adolesc Med Health; 1987 May; 3(2):101-19. PubMed ID: 12315578 [Abstract] [Full Text] [Related]