@article{NUMA_1986__48_133073,
     author = {Youcef Saad},
     title = {On the {Condition} {Number} of some {Gram} {Matrices} {Arising} from {Least} {Squares} {Approximation} in the {Complex} {Plane.}},
     journal = {Numerische Mathematik},
     pages = {337--348},
     publisher = {mathdoc},
     volume = {48},
     year = {1986},
     zbl = {0602.65025},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1986__48_133073/}
}