1. Greenler, R. Rainbows, Halos, and Glories (Cambridge, New York, 1980).
2. Tricker, R. A. R. Introduction to Meteorological Optics (American Elsevier, New York, 1970); Ice Crystal Haloes (Optical Society of America, Washington DC, 1970).
3. Minneart, M. The Nature of Light and Colour in the Open Air (transl. Kremer-Priest, H. M.) (rev. Brian, K. E.) (Dover, New York, 1954).
4. Dietz, G. Einfuhrung in die Optik der Atmosphaere. (Akademische Verlagsgesellschaft, Leipzig, 1957).
5. Tape, W. J. opt. Soc. Am. 70, 1175–1192 (1980).