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Translated from Trudy Seminara imeni I. G. Petrovskogo, No. 8, pp. 21–57, 1982.
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Arnol'd, V.I. Evolution of singularities of potential flows in collision-free media and the metamorphosis of caustics in three-dimensional space. J Math Sci 32, 229–258 (1986). https://doi.org/10.1007/BF01106069
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DOI: https://doi.org/10.1007/BF01106069