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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 19, No. 1, pp. 95–98, January– February, 1967.
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Kukharchuk, N.M. Some questions of variational calculus for functionals of vector functions with values in a Banach space. Ukr Math J 19, 81–83 (1967). https://doi.org/10.1007/BF01085174
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DOI: https://doi.org/10.1007/BF01085174