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Pyatkov, S.G., Abasheeva, N.L. Solvability of Boundary Value Problems for Operator-Differential Equations of Mixed Type. Siberian Mathematical Journal 41, 1174–1187 (2000). https://doi.org/10.1023/A:1004888707894
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DOI: https://doi.org/10.1023/A:1004888707894