D’ONOFRIO, Felice. Contraception and natural rhythm methods: considerations. Medicina e Morale, [S. l.], v. 39, n. 1, p. 93–114, 1990. DOI: 10.4081/mem.1990.1189. Disponível em: https://www.medicinaemorale.it/mem/article/view/1189. Acesso em: 15 nov. 2024.