@article{SEMR_2011_8_a12,
     author = {V. V. Ivanov},
     title = {Riccati equation and linear oscillators of variable frequency},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {159--162},
     publisher = {mathdoc},
     volume = {8},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2011_8_a12/}
}