Geodesic
The approximate determination of the period of the periodic solution of a certain strongly nonlinear system
Differencialʹnye uravneniâ, Tome 10 (1974) no. 8, pp. 1412-1422 
N. P. Morozov. The approximate determination of the period of the periodic solution of a certain strongly nonlinear system. Differencialʹnye uravneniâ, Tome 10 (1974) no. 8, pp. 1412-1422. http://geodesic.mathdoc.fr/item/DE_1974_10_8_a8/
@article{DE_1974_10_8_a8,
     author = {N. P. Morozov},
     title = {The approximate determination of the period of the periodic solution of a certain strongly nonlinear system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1412--1422},
     year = {1974},
     volume = {10},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_8_a8/}
}
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