@article{MZM_1992_51_5_a11,
     author = {E. M. Orynbasarov and M. A. Sadybekov},
     title = {The basis property of the system of eigen- and associated functions of a boundary value problem with shift for the wave equation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {86--89},
     year = {1992},
     volume = {51},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1992_51_5_a11/}
}