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Translated from Litovskii Matematicheskii Sbornik, Vol. 13, No. 3, pp. 191–209, July–September, 1973.
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Strelits, S., Nekrashas, V. The existence of eigenvalues of a system of linear differential operators depending on a parameter. Lith Math J 13, 487–501 (1973). https://doi.org/10.1007/BF01563440
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DOI: https://doi.org/10.1007/BF01563440