%0 Journal Article %A A. A. Sarsenbi %A B. Kh. Turmetov %T Basis property of a system of eigenfunctions of a second-order differential operator with involution %J Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki %D 2019 %P 183-196 %V 29 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VUU_2019_29_2_a3/ %G ru %F VUU_2019_29_2_a3