Abstract
During the first half of this century research on halo phenomena seems to have been in a chaotic state. Particularly the lists and theoretical views of Bravais (1847), Pernter and Exner (1922), Minnaert (1954) and Visser (1957, 1960) about the rarest known halos did not have much in common.
© 1990 Optical Society of America
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