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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 13, No. 1, pp. 165–181, January–February, 1972.
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Roitberg, Y.A., Sheftel', Z.G. Nonlocal boundary-value problems for elliptic equations and systems. Sib Math J 13, 118–129 (1972). https://doi.org/10.1007/BF00967646
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DOI: https://doi.org/10.1007/BF00967646