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Communicated by J. Serrin
This work was supported by the Italian government through the Consiglio Nazionale delle Ricerche.
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Acerbi, E., Fusco, N. Semicontinuity problems in the calculus of variations. Arch. Rational Mech. Anal. 86, 125–145 (1984). https://doi.org/10.1007/BF00275731
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DOI: https://doi.org/10.1007/BF00275731