@article{10_4064_am_24_3_267_280,
     author = {Krystyna Zi\k{e}tak},
     title = {Strict spectral approximation of a matrix and some related problems},
     journal = {Applicationes Mathematicae},
     pages = {267--280},
     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1997},
     doi = {10.4064/am-24-3-267-280},
     zbl = {0885.15016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-24-3-267-280/}
}