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References:
[1] BORŮVKA O.: Lineaг Diffeгential Transformations of the Second Order. The English Univeгsities Press, London 1971.
[2] NEUMAN F.: Constгuction of diffeгential equations with coexisting periodic solutions. Bull. Inst. Pol. Jassy (Romania) 16 (20), 1970, 67-75. MR 0283305
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