@article{DAN_1990_313_4_a11,
     author = {M. Yu. Yunusov},
     title = {Conjugacy problems for operator-differential equations with a small parameter},
     journal = {Doklady Akademii Nauk},
     pages = {824--827},
     publisher = {mathdoc},
     volume = {313},
     number = {4},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_313_4_a11/}
}