Zázrak mnoha sluncí na nebi
Rozhledy matematicko-fyzikální, Tome 84 (2009) no. 1, pp. 18-23.

Voir la notice de l'article dans Czech Digital Mathematics Library

The atmosphere sometimes trifles with light in such a way that anybody who looks at the sky must wonder. Halos are ranked among the most interesting visual spectacles. Moreover, some of them have not been explained yet. It is no wonder as people may have a chance to see them only once in a century. Don’t miss the opportunity, watch the sky! 
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     author = {V\v{e}tvi\v{c}ka, Ivan},
     title = {Z\'azrak mnoha slunc{\'\i} na nebi},
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Větvička, Ivan. Zázrak mnoha sluncí na nebi. Rozhledy matematicko-fyzikální, Tome 84 (2009) no. 1, pp. 18-23. https://geodesic-test.mathdoc.fr/item/RMF_2009__84_1_a4/