@article{VUU_2019_29_2_a3,
     author = {A. A. Sarsenbi and B. Kh. Turmetov},
     title = {Basis property of a system of eigenfunctions of a second-order differential operator with involution},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {183--196},
     year = {2019},
     volume = {29},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2019_29_2_a3/}
}