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Note on the periodic solutions of systems of ordinary differential equations
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 12 (1972) no. 1, pp. 7-14 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Karim, Rahmi Ibrahim Ibrahim Abdel. Note on the periodic solutions of systems of ordinary differential equations. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 12 (1972) no. 1, pp. 7-14. http://geodesic.mathdoc.fr/item/AUPO_1972_12_1_a0/

[1] R. I. I. Abdel Karim: Studium des Resonanzfalles bei Systemen gewöhnlicher Differentialgleichungen. Arch. Rational Mech. Anal. 10, 229 241 (1962). | MR

[2] R. I. I. Abdel Karim: Über den Resonanzfall bei gewöhnlichen linearen Differentialgleichungen n-ter Ordnung mit periodischen veränderlichen Koeffizienten. Archivum mathematicum (Brno), T. 3, 11- 30 (1967). | MR

[3] R. I. I. Abdel Karim: On the vector solution of the system of the differential equations x' = A(t)x + f(t) . U. pub. in Acta F. R. N. (Bratislava).

[4] W. Schmeidler: Vorträge über Determinanten und Matrizen mit Anwendungen in Physik und Technik. Berlin: Akademie Verlag 1949. | Zbl