@article{IVM_1987_3_a0,
     author = {V. V. Amel'kin and V. \`E. Zhavnerchik},
     title = {The existence of several periodic solutions to equations of {Li\'enard} type},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--5},
     publisher = {mathdoc},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1987_3_a0/}
}