@article{MMO_1959_8_a5,
     author = {V. A. Chechik},
     title = {Investigation of systems of ordinary differential equations with a singularity},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {155--198},
     publisher = {mathdoc},
     volume = {8},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1959_8_a5/}
}