Annales Polonici Mathematici · 1969 · 105 citations · 0 references
Natural SciencesMathematicsPhysicsDifferential EquationsDynamical SystemsChaos TheoryDissipative SystemsInitial Value ProblemsStability TheorySystems Of Differential EquationsOscillatory DynamicsSecond-order Differential EquationsSmall OscillationsSturm - Liouville TheorySturm-liouville Theory