@misc{misc9cf52996, title = {Toxoplasmosis seronegativity regional variation in Sao Paulo metropolitan area}, author = {Guimarães, A C S and Kawarabayashi, M and Borges, M M and Tolezano, J E and Andrade Júnior, Heitor Franco de}, year = {1993}, booktitle = {Jornada Científica do Instituto de Medicina Tropical de São Paulo} }