9American Public Health Association (APHA).Standard Methods for the Examination of Water and Wastewater[M].(20th ed).Washington,D C:American Public Health Association,1998.145 -149.
10Liyanage L R J,Finch G R,Belosevic M.Sequential disinfection of Cryptnsporidium parvum by ozone and chlorine dioxide[J].Ozone Science and Engineering,1997,19(4):409 - 423.