@article{MZ_1988__198_3_173936,
     author = {Miche\'al \'O. Searc\'oid},
     title = {Economical {Finite} {Rank} {Perturbations} of {Semi-Fredholm} {Operators.}},
     journal = {Mathematische Zeitschrift},
     pages = {431--434},
     publisher = {mathdoc},
     volume = {198},
     number = {3},
     year = {1988},
     zbl = {0628.47004},
     url = {http://geodesic.mathdoc.fr/item/MZ_1988__198_3_173936/}
}