@article{10_4153_CMB_1974_053_7,
     author = {Groetsch, C. W.},
     title = {Steepest {Descent} and {Least} {Squares} {Solvability}},
     journal = {Canadian mathematical bulletin},
     pages = {275--276},
     year = {1974},
     volume = {17},
     number = {2},
     doi = {10.4153/CMB-1974-053-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-053-7/}
}