@article{PFMT_2014_1_a11,
     author = {A. T. Sazonova},
     title = {On solutions of simplified systems of nonlinear differential equations related to the problem of four bodies},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {69--73},
     publisher = {mathdoc},
     number = {1},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2014_1_a11/}
}