@article{NUMA_1987__55_4_133376,
     author = {M. Arioli and I.S. Duff and P.P.M. de Rijk},
     title = {On the {Augmented} {System} {Approach} to {Sparse} {Least-Squares} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {667--684},
     publisher = {mathdoc},
     volume = {55},
     number = {4},
     year = {1987},
     zbl = {0678.65024},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1987__55_4_133376/}
}