@article{PFMT_2014_3_a14,
     author = {A. T. Sazonova},
     title = {On the solutions of the simplified system of nonlinear differential equations in the motion of four particles in a plane},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {80--84},
     publisher = {mathdoc},
     number = {3},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2014_3_a14/}
}