@article{IVM_1973_11_a7,
     author = {G. E. Popov},
     title = {Approximate determination of a~limit cycle of a~certain equation with a~small parameter},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {66--70},
     publisher = {mathdoc},
     number = {11},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1973_11_a7/}
}