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Translated from Itogi Nauki i Tekhniki, Seriya Sovremennaya Matematika i Ee Prilozheniya. Tematicheskie Obzory. Vol. 11, Geometry-2, 1994.
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Evtushik, L.E. Geometry of ordinary differential equations. Investigations of Laptev-Vasil'ev seminar at the Moscow University (1980–1992). J Math Sci 78, 253–286 (1996). https://doi.org/10.1007/BF02365191
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DOI: https://doi.org/10.1007/BF02365191