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On an algebraic structure of a group of phases. (English) Zbl 0388.34003

34A30 Linear ordinary differential equations and systems
34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
34C99 Qualitative theory for ordinary differential equations
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[1] BORŮVKA O.: Linear Differential Transformations of the Second Order. The English Universities Press, London 1971. · Zbl 0218.34005
[2] NEUMAN F.: Construction of differential equations with coexisting periodic solutions. Bull. Inst. Pol. Jassy (Romania) 16 (20), 1970, 67-75. · Zbl 0267.34039
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