@article{DE_1984_20_1_a24,
     author = {N. T. Durdyev and M. B. Orazov},
     title = {Completeness of the root functions in some eigenvalue problems for fourth-order equations of mixed type},
     journal = {Differencialʹnye uravneni\^a},
     pages = {174--176},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_1_a24/}
}