Geodesic
Some questions of the spectral theory of operator-matrices
Matematičeskie zametki, Tome 50 (1991) no. 2, pp. 157-159.

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     author = {A. Fraguela Collar},
     title = {Some questions of the spectral theory of operator-matrices},
     journal = {Matemati\v{c}eskie zametki},
     pages = {157--159},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_2_a22/}
}
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A. Fraguela Collar. Some questions of the spectral theory of operator-matrices. Matematičeskie zametki, Tome 50 (1991) no. 2, pp. 157-159. http://geodesic.mathdoc.fr/item/MZM_1991_50_2_a22/