Chaia, G. .; Silva, E. F. da .; Vilela, C. C. .; Chiari, L. . Isolation and Maintenance of a Strain of Entamoeba Histolytica Schaudinn, 1903 and the Possibility of Its Utilization in Screening of Drugs. Rev. Inst. Med. Trop. São Paulo 1977, 19 (3), 195-201.