7Backman-H, Haghighat-F. Indoor air quality and ocular discomfort[J] .J AM optom Assoc, 1999, 70(5) :309 - 316.
8Nordstrom K, Norback D, Akselsson R. Effect of air humidification on the sick building syndrome and perceived indoor air quality in hospitals: A four month longitudinal study [J ]. Occup Environ Med, 1994, 51(10) :683 - 688.
9Keller DW.Community Outbreak of Legionnairesp disease:an investigation confirmingthe potential for coolingtowers totransmit legionella species[J].Clin Infect Dis,1996,22:2572261.
10Keller BW,Hajjeh R,Maria AD,et al.Community outbreak of Legionnaires'disease:An investigation confirming the potential for cooling tower to transmit Legionella species[J].Clin Infect Dis,1996,22:2572261.
