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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 27, No. 2, pp. 240–243, March–April, 1975.
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Lykova, O.B. On the contraction principle for a differential equation with unbounded operator coefficient. Ukr Math J 27, 192–194 (1975). https://doi.org/10.1007/BF01090004
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DOI: https://doi.org/10.1007/BF01090004