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Additional information
Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 26, No. 2, pp. 187–191, March–April, 1985.
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Yanushauskas, A.I. Influence of lowest terms on the formulation of boundary problems for a system of first-order partial differential equations. Sib Math J 26, 309–313 (1985). https://doi.org/10.1007/BF00968778
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DOI: https://doi.org/10.1007/BF00968778