1. 1. Schaefer, V. J., 1942: Use of snowflake replica for studying winter storms. Nature, 149, p. 81.
2. 2. Higuchi, K., 1957: A new method for recording the grain structure of ice. J. of Glaciology, 3, pp. 131-133.
3. 3. Higuchi, K., 1958: The etching of ice crystals. Acta Metallurgica, 6, pp. 636-642.
4. 4. Higuchi, K., 1958: Layer structure of ice crystal revealed by etching figures. Symposium Chamonix, Physics of the movement of the ice. pp. 249-253.
5. 5. Nakaya, U., Hanajima, M. and Muguruma, j., 1958: Physical Investigations on the growth of snow crystals. J. Fac. Sci. Hokkaido University, Ser. II, 5, pp. 87-118.