Geodesic
Strong isochronous Newton's systems with quadratic with respect to speed power function
Trudy Instituta matematiki, Tome 14 (2006) no. 1, pp. 30-35.

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The coefficient criteria of a strong isochronicity of the Newton's system with quadratic with respect to speed power function is obtained. 
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V. V. Amel'kin; O. B. Korsantia. Strong isochronous Newton's systems with quadratic with respect to speed power function. Trudy Instituta matematiki, Tome 14 (2006) no. 1, pp. 30-35. http://geodesic.mathdoc.fr/item/TIMB_2006_14_1_a3/

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