@article{SEMR_2014_11_a77,
     author = {T. H. Rasulov and I. O. Umarova},
     title = {Spectrum and resolvent of a block operator matrix},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {334--344},
     publisher = {mathdoc},
     volume = {11},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2014_11_a77/}
}