Author: Karim, Rahmi Ibrahim Ibrahim Abdel
- : Note on the periodic solutions of systems of ordinary differential equations. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica-Physica-Chemica, vol. 12 (1972), issue 1, pp. 7-14
- : Studium des Resonanzfalles bei gewöhnlichen linearen reduzierten Differentialgleichungen mit periodischen Koeffizienten. (German) [Study of a resonance case for ordinary linear reduced differential equations with periodic coeficients]. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica-Physica-Chemica, vol. 9 (1968), issue 1, pp. 27-49
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