E. R. M. Marana, I. T. Navarro, O. Vidotto, R. L. Freire, and R. Lott, “Occurrence of anticorps anti-Toxoplasma gondii in beef cattle sacrified in the North of Paraná-Brazil”, Semina: Ciênc. Agrár., vol. 15, no. 1, pp. 38–40, Jan. 1994.