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Translated from Itogi Nauki i Tekhniki, Seriya Sovremenaya Matematika i Ee Prilozheniya. Tematicheskie Obzory. Vol. 20, Topologiya-3, 1994
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Kazarian, M.E. Umbilical characteristic number of Lagrangian mappings of a 3-dimensional pseudooptical manifold. J Math Sci 82, 3672–3679 (1996). https://doi.org/10.1007/BF02362572
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DOI: https://doi.org/10.1007/BF02362572