@article{VUU_2020_30_2_a6,
     author = {L. I. Mammadova and I. M. Nabiev},
     title = {Spectral properties of the {Sturm--Liouville} operator with a spectral parameter quadratically included in the boundary condition},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {237--248},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2020_30_2_a6/}
}