@article{DE_1990_26_5_a23,
     author = {V. N. Laptinskii and V. V. Pugin},
     title = {On representations of solutions of {Riccati} matrix differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {906--907},
     year = {1990},
     volume = {26},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_5_a23/}
}