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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 12, No. 1, pp. 197–203, January–February, 1971.
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Fedorovskii, V.G. Estimates of the solutions to invariant hyperbolic systems of the first order. Sib Math J 12, 143–147 (1971). https://doi.org/10.1007/BF00969150
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DOI: https://doi.org/10.1007/BF00969150