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Additional information
Rostov-on-the-Don. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 27, No. 1, pp. 111–122, January–February, 1985.
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Levendorskii, S.Z. Asymptotic behavior of the spectra of weakly elliptic systems of pseudodifferential operators. Sib Math J 27, 89–99 (1986). https://doi.org/10.1007/BF00969346
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DOI: https://doi.org/10.1007/BF00969346