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Communicated by C. Dafermos
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Toland, J.F. A duality principle for non-convex optimisation and the calculus of variations. Arch. Rational Mech. Anal. 71, 41–61 (1979). https://doi.org/10.1007/BF00250669
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DOI: https://doi.org/10.1007/BF00250669