Levy, Maria Stella Ferreira, and Rosalba de Almeida Molêdo. “ Variations in Fertility: Comparison Between Three Cohorts ”. Revista de Saúde Pública 6, no. 3 (September 1, 1972): 293–299. Accessed April 29, 2024. https://www.revistas.usp.br/rsp/article/view/4660.