@article{DE_2003_39_2_a16,
     author = {L. A. Danilovich and V. N. Laptinskii},
     title = {On {Periodic} {Solutions} of a {Lyapunov} {Type} {Equation}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {281--283},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_2_a16/}
}