4Furuhashi M. Efficiency of bacterial filtration in various commercial air filters for hospital air conditioning [ J ]. Bull Tokyo Med Dent Univ, 1978; 25(3) :147.
5Brickner PW, Vincent RL, First M, et al. The application of ultraviolet germicidal irradiation to control transmission of airborne disease: biotenorism countermeasure [ J ]. Public Health Rep,2003; 118(2): 99.
