@article{DE_1982_18_11_a23,
     author = {V. E. Kryutchenko},
     title = {On a fundamental system of solutions of a fourth-order linear differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1993--1994},
     publisher = {mathdoc},
     volume = {18},
     number = {11},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1982_18_11_a23/}
}