@article{DE_1984_20_8_a24,
     author = {M. G. Zavgorodnii},
     title = {The spectrum of a multipoint boundary value problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1443--1444},
     year = {1984},
     volume = {20},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_8_a24/}
}