@article{CC_2007_36_3_a21,
     author = {Zolezzi, T.},
     title = {Condition numbers and {Ritz} type methods in unconstrained optimization},
     journal = {Control and Cybernetics},
     pages = {811--822},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {2007},
     zbl = {1166.49023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2007_36_3_a21/}
}