@article{VYURM_2020_12_3_a1,
     author = {V. Ala and Kh. R. Mamedov},
     title = {On basis property of root functions for a class of the second order differential operators},
     journal = {Vestnik \^U\v{z}no-Uralʹskogo gosudarstvennogo universiteta. Seri\^a, Matematika, mehanika, fizika},
     pages = {15--21},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VYURM_2020_12_3_a1/}
}