@article{CMJ_2006__56_3_a9,
     author = {Kuzma, Bojan},
     title = {Noninvertibility preservers on {Banach} algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {919--921},
     publisher = {mathdoc},
     volume = {56},
     number = {3},
     year = {2006},
     mrnumber = {2261663},
     zbl = {1164.46337},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/CMJ_2006__56_3_a9/}
}