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Additional information
Institute of Theoretical and Applied Mechanics, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 21, No. 4, pp. 175–179, July–August, 1980.
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Lar'kin, N.A. Inequalities for degenerating hyperbolic operators. Sib Math J 21, 613–616 (1980). https://doi.org/10.1007/BF00995965
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DOI: https://doi.org/10.1007/BF00995965