@article{UFA_2017_9_1_a9,
     author = {B. T. Bilalov and T. B. Gasymov},
     title = {On basicity of eigenfunctions of second order discontinuous differential operator},
     journal = {Ufa mathematical journal},
     pages = {109--122},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2017_9_1_a9/}
}