@article{DAN_1991_319_2_a4,
     author = {A. A. Lyashenko},
     title = {On the completeness of the system of generalized eigenfunctions of an operator generated by the first boundary value problem for the 
},
     journal = {Doklady Akademii Nauk},
     pages = {278--282},
     publisher = {mathdoc},
     volume = {319},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_2_a4/}
}