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@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/} }
V. P. Serebryakov. Weyl discs for Jacobi block matrices. Differencialʹnye uravneniâ, Tome 22 (1986) no. 9, pp. 1545-1551. http://geodesic.mathdoc.fr/item/DE_1986_22_9_a8/