1. Hallett, J. (1964): Experimental studies of the crystallization of supercooled water. J. Atmos. Sci., 21, 671-682.
2. Higuchi, K. and T. Yoshida, 1967: Crystallographic orientation of frozen droplets on ice surfaces. Physics of Snow and Ice. Inst. Low Temperature Science, Hokkaido Univ., Part 1, 79-93.
3. Lee, Chung Woo and C. Magono, 1967: On the vertical distribution of snow crystals in relation with conditions revealed by two point radiosonde soundings. J. Meteor. Soc. Japan, 45, 343-352.
4. Magono, C. and Chung Woo Lee, 1966: Meteorological classification of natural snow crystals. J. Fac. Svi., Hokkaido Univ., Ser VII. 2, 321-335.
5. Magono, C. and H. Aburakawa, 1968: Experimental studies on snow crystals of plane type with spatial branches. J. Fac. Sc., Hokkaido Univ., Ser. VII 3, 85-97.