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Translated from Issledovaniya po Prikladnoi Matematike, No. 3, pp. 92–96, 1975.
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Korablev, A.I. Directional derivatives of quasiconvex functionals. J Math Sci 41, 1425–1428 (1988). https://doi.org/10.1007/BF01097072
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DOI: https://doi.org/10.1007/BF01097072