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Qualitative Theory of Differential Equations: Proceedings of the Third Colloquium on the Qualitative Theory of Differential Equations, Szeged, ... MATHEMATICA SOCIETATIS JANOS BOLYAI)
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Qualitative Theory of Differential Equations: Proceedings of the Third Colloquium on the Qualitative Theory of Differential Equations, Szeged, ... MATHEMATICA SOCIETATIS JANOS BOLYAI)