@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},
     publisher = {mathdoc},
     volume = {10},
     number = {8},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1974_10_8_a8/}
}