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• Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica

Author: Dłotko, Tadeusz

• Dłotko, Tadeusz: Periodic solutions of some second order differential systems. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 32 (1993), issue 1, pp. 35-41