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Magnitogorsk Mining and Metallurgical Institute, Magnitogorsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 20, No. 3, pp. 557–578, May–June, 1979.
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Ivrii, V.Y. Wave fronts of solutions of symmetric pseudodifferential systems. Sib Math J 20, 390–405 (1979). https://doi.org/10.1007/BF00969944
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DOI: https://doi.org/10.1007/BF00969944