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Author: Olach, Rudolf

• Olach, Rudolf; Šamajová, Helena: Oscillatory properties of nonlinear differential systems with retarded arguments. (English). Mathematica Slovaca, vol. 55 (2005), issue 3, pp. 307-316
• Olach, Rudolf: Oscillation of first order linear retarded equations. (English). Mathematica Slovaca, vol. 51 (2001), issue 5, pp. 547-557