@article{DE_2005_41_4_a6,
     author = {E. N. Smetannikova and V. A. Sobolev},
     title = {A {Periodic} {Singularly} {Perturbed} {Problem} for the {Matrix} {Riccati} {Equation}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {500--507},
     publisher = {mathdoc},
     volume = {41},
     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_4_a6/}
}