@article{FAA_1968_2_2_a8,
     author = {S. P. Shishatskii},
     title = {The correctness of boundary problems for a second-order differential equation with a self-adjoint negative operator in a {Hilbert} space},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {81--85},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a8/}
}