@article{ETNA_2008__31__a23,
     author = {Paige,  Christopher C. and Panayotov,  Ivo},
     title = {Majorization bounds for {Ritz} values of {Hermitian} matrices},
     journal = {Electronic transactions on numerical analysis},
     pages = {1--11},
     year = {2008},
     volume = {31},
     zbl = {1171.15019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2008__31__a23/}
}