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L. Eisenhart:Continuous Groups of Transformations (New York, N. Y., 1961), p. 34;R. Hermann:Differential Geometry and the Calculus of Variations (New York, N. Y., 1968), p. 39.
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González-Grascón, F. Reduction of vector fields to Newtonlike vector fields. Lett. Nuovo Cimento 21, 277–280 (1978). https://doi.org/10.1007/BF02763085
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DOI: https://doi.org/10.1007/BF02763085