@article{DE_1987_23_11_a22,
     author = {N. A. Rustamov},
     title = {Asymptotic behavior of the eigenvalues of a fourth-order differential operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2004--2006},
     year = {1987},
     volume = {23},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_11_a22/}
}