@article{FAA_1976_10_4_a6,
     author = {A. A. Shkalikov},
     title = {The completeness of eigenfunctions and associated functions of an ordinary differential operator with irregular-separated boundary conditions},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {69--80},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1976_10_4_a6/}
}