8Chandler,T.J..The Climate of London[M].London:Hutchinson,1965.
9Jenkins,I..Increase in averages of sunshine in central London[J].Weather,1969,24:52-54.
10P.Squires,S.Twomey.The Relation between Cloud Droplet Spectra and the Spectrum of Cloud Nuclei[A].Helmut K.Weickmann.Physics of Precipitation[C].Baltimore:Wavely Press,Inc.,1960.