Geodesic
On a nonlinear isochronous system
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (2013), pp. 59-63

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A system of nonlinear ordinal differential equations of second order is considered. It is shown analytically that the solutions of this system are isochronous, which is not characteristic for nonlinear systems. It is also shown that the periodic delta-function is a limiting case for the solution if the amplitude tends to infinity. 
@article{VMUMM_2013_6_a12,
     author = {V. M. Budanov},
     title = {On a nonlinear isochronous system},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {59--63},
     publisher = {mathdoc},
     number = {6},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2013_6_a12/}
}
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V. M. Budanov. On a nonlinear isochronous system. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 6 (2013), pp. 59-63. http://geodesic.mathdoc.fr/item/VMUMM_2013_6_a12/