6International Organization of Standardization. ISO11140-4,Sterilization of health care products-chemical indicators-part4:Class 2 indicators as an altemative to the Bowie and Dick-type test for detection of steam penetration [ S ]. 2007 : 30.
7International Organization of Standardization. ISO11140-5,Sterilization of health care products-Chemical indicators-partS:Class 2 indicators for Bowie and Dick-type air removal tests[S]. 2007:9.
8European Norm. EN285:2006 Steam Sterilizer-Large Sterilizer[S]. European Committee for Standardization,2006:44.
9Association for the Advancement of AMMI ST 79: Comprehensive guide assurance in the health care facilities 2006:10 Medical Instrumentation, ANSI/ to steam sterilization and sterility [S]. American National Stand,
