@article{ZNSL_1994_219_a0,
     author = {L. Yu. Kolotilina},
     title = {Eigenvalue bounds for block preconditioned matrices},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--41},
     publisher = {mathdoc},
     volume = {219},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1994_219_a0/}
}