Classification of symmetries for higher order Lagrangian systems II: The non-autonomous case. Manuel de León, David Martín de Diego (1994) Extracta Mathematicae
Classification of symmetries for higher order Lagrangian systems. Manuel de León, David Martín de Diego (1994) Extracta Mathematicae
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Convexity Properties of the Moment Mapping. V. Guillemin, S. Sternberg (1982) Inventiones mathematicae