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Additional information
Gor'kii State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 13, No. 3, pp. 1126–1137, August, 1970.
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Shil'man, S.V. On a certain analytic method in the theory of linear differential equations having periodic coefficients and stationary delays of the argument. I. Radiophys Quantum Electron 13, 874–883 (1970). https://doi.org/10.1007/BF01030919
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DOI: https://doi.org/10.1007/BF01030919