JOHN, M PDEVI, S1960-09-012009-05-311960-09-012009-05-311960-09-01JOHN MP, DEVI S. Diagnosis of ovulation and determination of time of ovulation by fern-crystallisation test of cervical mucus. Journal of the Indian Medical Association. 1960 Sep; 35(): 206-8http://imsear.searo.who.int/handle/123456789/104062engCervix Uteri --physiologyInfertility, Female --diagnosisOvulation --physiologyDiagnosis of ovulation and determination of time of ovulation by fern-crystallisation test of cervical mucus.Journal Article