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2. 2. Sano, I, and Fukuta, N. (1956) : Effects of Water Vapor, Ammonia and Hydrogen Sulfide against the Decay of Silver Iodide Smoke under Irradiation of Ultraviolet Light, J. Met. Soc. Japan, 34, No. 1, 34.
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4. 4. Nakaya, U. (1949) : Studies on Snow-Forms of Snow Crystals and their Formation (written in Japanese). Hanajima, M. (1942) : On the External Conditions Controlling the Formation of Snow Crystals, J. Met. Soc. Japan, 20, 238.
5. 5. aufm Kampe, H. J., Weickmann, H. K. and Kelley, J. J. (1951): The Influence of Temperature on the Shape of Ice Crystals Growing at Water Saturation, J. Met., 8, 168.