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H. Bohr andW. Fenchel, Ein Satz über stabile Bewegungen in der Ebene. In: Harald Bohr Collected Mathematical Works, Vol. II, C. 38. Copenhagen 1952.
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Research supported in part by the Office of Naval Research under contract Nonr-3693(00).
We are grateful toJoseph Auslander for conversations which resulted in this paper.
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Seibert, P., Tulley, P. On dynamical systems in the plane. Arch. Math 18, 290–292 (1967). https://doi.org/10.1007/BF01900636
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DOI: https://doi.org/10.1007/BF01900636