@article{DE_1993_29_8_a6,
     author = {A. P. Makhmudov and Z. S. Aliev},
     title = {Some global results for fourth-order nonlinear spectral {Sturm--Liouville} problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1330--1339},
     publisher = {mathdoc},
     volume = {29},
     number = {8},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_8_a6/}
}