@article{DAN_1989_309_1_a6,
     author = {A. P. Makhmudov and Z. S. Aliyev},
     title = {Some global results for linearizable and nonlinearizable fourth-order {Sturm--Liouville} problems},
     journal = {Doklady Akademii Nauk},
     pages = {34--38},
     publisher = {mathdoc},
     volume = {309},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_1_a6/}
}