@article{DE_1986_22_9_a8,
     author = {V. P. Serebryakov},
     title = {Weyl discs for {Jacobi} block matrices},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1545--1551},
     publisher = {mathdoc},
     volume = {22},
     number = {9},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_9_a8/}
}