@article{DAN_1986_291_3_a4,
     author = {V. A. Il'in and E. I. Moiseev},
     title = {A nonlocal boundary value problem for the {Sturm--Liouville} operator in a differential and a difference treatment},
     journal = {Doklady Akademii Nauk},
     pages = {534--539},
     publisher = {mathdoc},
     volume = {291},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_291_3_a4/}
}