Authors: ECOCHARD R PINGUET F ECOCHARD I DEGOUVELLO R GUY M HUY F

Citation: R. Ecochard et al., ANALYSIS OF FAILURE OF NATURAL FAMILY-PLA NNING - AN ANALYSIS CARRIEDOUT OVER 7007 CYCLES, Contraception fertilite sexualite, 26(4), 1998, pp. 291-296