References
Cesari, L., and L. H. Turner, «On a Lemma in the Direct Method of the Calculus of Variations», Rendiconti del Circolo Matematico di Palermo, Serie II—Tomo VI, 1957, pp. 109–113.
Cesari L. «An Existence Theorem of Calculus of Variations for Integrals on Parametric Surfaces», Amer. J. Math., Vol. 74, 1952, pp. 265–295.
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Bellman, R. On a differential inequality of Cesari and Turner. Rend. Circ. Mat. Palermo 7, 34–36 (1958). https://doi.org/10.1007/BF02854384
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DOI: https://doi.org/10.1007/BF02854384