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Clinical Trials / Research
BOM and Avoiding Pregnancy
Scientific Basis of the Billings Ovulation Method
The Discovery of Different Types of Cervical Mucus and the Billings Ovulation Method
by Erik Odeblad.
Foreword to "Studies on Human Reproduction"
Monograph by James B. Brown, M.Sc., Ph.D., D.Sc., F.R.A.C.O.G.
Evaluation of the Effectiveness of a Natural Fertility Regulation Programme in China
Choosing your baby's sex