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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 2, pp. 190–194, March–April, 1987.
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Lykova, O.B., Vladimirov, V.N. Application of sign-constant functions to the theory of integral manifolds. Ukr Math J 39, 158–161 (1987). https://doi.org/10.1007/BF01057497
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DOI: https://doi.org/10.1007/BF01057497