doi> FS, B. ; LF, M. ; AAS, P. ; EF, S. ; Lopes, Angela Hampshire ; W, S. ; MEYER-FERNANDES, J. R. . Characterization of Ecto-ATPase activities present on the surface of Entamoeba histolytica. Archives of Biochemistry and Biophysics, Estados Unidos -, v. 375, n.002, p. 304-314, 2000.