1. Arakawa, H.: 1954, ‘Climatic Changes Revealed from the Freezing Dates of Suwa in Central Japan’,Sci. Proc. Int. Assoc. Meteor. Rome, September, 145–146.
2. Brooks, C. E. P.: 1934, ‘The Variation of the Annual Frequency of Thunderstorms in Relation to Sunspots’,Quart. J. Royal Meteorol. Soc. 60, 153–166.
3. Bryson, R. A. and Hare, F. K.: 1973, inWorld Survey of Climatology, Vol. 11, Elsevier, Amsterdam.
4. Bryson, R. A. and Murray, T. J.: 1977,Climates of Hunger, Univ. of Wisconsin Press, 171 pp.
5. Byers, H. R. and Braham, R. R.: 1949,The Thunderstorm, U.S. Government Printing Office, Washington, D.C.