@article{CMUC_2009_50_1_a5,
     author = {Barnes, Bruce A.},
     title = {Linear inessential operators and generalized inverses},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {75--82},
     year = {2009},
     volume = {50},
     number = {1},
     mrnumber = {2562804},
     zbl = {1212.47001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2009_50_1_a5/}
}