@article{DAN_1977_235_2_a4,
     author = {N. B. Engibaryan and M. G. Muradyan},
     title = {Linear differential equations and {Riccati} equations},
     journal = {Doklady Akademii Nauk},
     pages = {263--265},
     publisher = {mathdoc},
     volume = {235},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_235_2_a4/}
}