@article{VUU_2020_30_1_a4,
     author = {V. P. Tanana},
     title = {Completeness of the system of eigenfunctions of the {Sturm{\textendash}Liouville} problem with the singularity},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {59--63},
     year = {2020},
     volume = {30},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2020_30_1_a4/}
}