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7. 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]
19. [The "ovulation method" in the framework of contraception]. Valle G. Aggiorn Ostet Ginecol; 1973 Mar; 6(5):145-6. PubMed ID: 12307129 [Abstract] [Full Text] [Related]