@article{guimarães_kawarabayashi_borges_tolezano_andrade jr._1993,  title={Regional variation in toxoplasmosis seronegativity in the São Paulo metropolitan region},  volume={35},  ISSN={0036-4665},  url={https://doi.org/10.1590/S0036-46651993000600001},  DOI={10.1590/S0036-46651993000600001},  number={6},  journal={Revista do Instituto de Medicina Tropical de São Paulo},  publisher={Instituto de Medicina Tropical de São Paulo},  author={Guimarães, A.C.S. and Kawarabayashi, M. and Borges, M.M. and Tolezano, J.E. and Andrade Jr., H.F.},  year={1993},  month={Nov},  pages={479–483} }