Navarro, I. T.; Vidotto, O.; Tudury, E. A.; Vianna, C. C.; Freire, R. L. Antibodies Prevalence Against Toxoplasma Gondii in Dogs Assisted at the Veterinary Hospital of the State University of Londrina (Paraná, Brazil). Semina: Ciênc. Agrár. 1992, 13, 66-69.