Roncada, M.J. 1975. Survey conducted among migrants going through the "Central de Triagem e Encaminhamento (CETREN)" in S. Paulo City, Brazil: II. Biochemical aspects of hipovitaminosis A . Revista de Saúde Pública. 9, 3 (Sep. 1975), 313–329. DOI:https://doi.org/10.1590/S0034-89101975000300005.