2Bovallius A et al. Long-range air transmission of bacteria. Appl Environ Microbiol, 1978,35(6) : 1231.
3Bovallius A et al. Three-year investigation of the natural airborne bacterial flora at four localities in Sweden. Appl Environ Microbiol, 1978,35(5):847.
4Bornstein N. Dispersion and survival of Legionella in air. Aerobiol- ogia, 1990,6( 1 ) :41.
5M.LNicodemus,W.T.Hodge,L.J.Weiner. Life of Climate. The Eneyclopedia of Climatology. American.
