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Original Russian Text © V.I. Ushakov, 2007, published in Izvestiya Vysshikh Uchebnykh Zavedenii. Matematika, 2007, No. 7, pp. 76–79.
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Ushakov, V.I. The sobolev type equations with a nonsurjective operator at the time derivative. Russ Math. 51, 72–75 (2007). https://doi.org/10.3103/S1066369X07070109
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DOI: https://doi.org/10.3103/S1066369X07070109