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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 28, No. 6, pp. 782–792, November–December, 1976.
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Sotnichenko, N.A., Feshchenko, S.F. The problem of eigenvalues and “turning points” in the theory of systems of linear differential equations. Ukr Math J 28, 600–609 (1976). https://doi.org/10.1007/BF01094127
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DOI: https://doi.org/10.1007/BF01094127