6ARROWOOD M J, STERLING C R. Isolation of Cryptosporidium oocysts and sporozoites using discontinuous sucrose and isopycnic percoll gradients [J]. J Parasitol,1987,73:314 -319.
7SURESH P,REHG J E. Comparative evaluation of techniques for purification of Cryptosporidium parvum oocysts from feces [ J ]. J Clin Microbio, 1996,34( 1 ) :38.
