@article{DAN_1987_294_6_a12,
     author = {V. A. Il'in and E. I. Moiseev},
     title = {The {Sturm--Liouville} operator with a nonlocal boundary condition of the second kind},
     journal = {Doklady Akademii Nauk},
     pages = {1340--1345},
     publisher = {mathdoc},
     volume = {294},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_6_a12/}
}