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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 1, pp. 178–181, January–February, 1975.
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Berkhin, P.E. On a boundary value problem for fourth-order equations of composite type. Sib Math J 16, 144–146 (1975). https://doi.org/10.1007/BF00967473
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DOI: https://doi.org/10.1007/BF00967473