Literature cited
L. S. Pontryagin, Continuous Groups [in Russian], Moscow-Leningrad, 1954.
L. V. Ovsyannikov, Group Properties of Differential Equations [in Russian], Novosibirsk, 1962.
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Translated from Izvestiya VUZ. Fizika, Vol 11, No. 11, pp. 7–16, November, 1968.
In conclusion, let me thank D. F. Kurdgelaidze for advice and discussions.
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Khukhunashvili, Z.V. Lagrange formalism and symmetry theory. I. Soviet Physics Journal 11, 1–10 (1968). https://doi.org/10.1007/BF00816057
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DOI: https://doi.org/10.1007/BF00816057