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V. Kapsukas Vilnius State University. Translated from Litovskii Matematicheskii Sbornik (Lietuvos Matematikos Rinkinys), Vol. 20, No. 3, pp. 63–76, July–September, 1980.
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Golokvosčius, P. Ordinary differential equations and differential operators. Lith Math J 20, 225–235 (1980). https://doi.org/10.1007/BF00967181
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DOI: https://doi.org/10.1007/BF00967181