@article{VMUMM_2004_3_a4,
     author = {A. A. Vladimirov and I. A. Sheipak},
     title = {Spectral properties of a certain operator matrix},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {23--30},
     year = {2004},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2004_3_a4/}
}