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48. Use-effectiveness of fertility awareness among the urban poor. Dorairaj K. Soc Action; 1984 Dec; 34(3):286-306. PubMed ID: 12339804 [Abstract] [Full Text] [Related]
49. Natural family planning. Nowland D. Plan Parent Eur; 1980 Apr; ():4-5. PubMed ID: 12263405 [Abstract] [Full Text] [Related]
50. The use of periodic abstinence for family planning. Labbok MH, Queenan JT. Clin Obstet Gynecol; 1989 Jun; 32(2):387-402. PubMed ID: 2663279 [Abstract] [Full Text] [Related]
53. Prospective European multi-center study of natural family planning (1989-1992): interim results. The European Natural Family Planning Study Groups. Adv Contracept; 1993 Dec; 9(4):269-83. PubMed ID: 8147240 [Abstract] [Full Text] [Related]
54. Identifying the fertile phase of the human menstrual cycle. Royston P. Stat Med; 1991 Feb; 10(2):221-40. PubMed ID: 2052801 [Abstract] [Full Text] [Related]
55. Natural family planning methods. Billings JJ. Am J Obstet Gynecol; 1982 May 01; 143(1):114-5. PubMed ID: 7081306 [Abstract] [Full Text] [Related]
56. [Cervical mucus as a biological sign of fertility and infertility]. Billings JJ. Contracept Fertil Sex (Paris); 1984 Feb 01; 12(2):379-80. PubMed ID: 12265827 [Abstract] [Full Text] [Related]
57. Billings natural family planning in Shanghai, China. Xu JX, Yan JH, Fan DZ, Zhang DW. Adv Contracept; 1994 Sep 01; 10(3):195-204. PubMed ID: 7863845 [Abstract] [Full Text] [Related]