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Discretization and some qualitative properties of ordinary differential equations about equilibria. Garay, B.M. — 1993 Acta Mathematica Universitatis Comenianae. New Series
A non-differentiablity result for the inversion operator between Sobolev spaces. Farkas, G.; Garay, B.M. — 2000 Zeitschrift für Analysis und ihre Anwendungen