@article{10_4153_CMB_2010_087_x,
     author = {Kim, Sang Og and Park, Choonkil},
     title = {Linear {Maps} on {C*-Algebras} {Preserving} the {Set} of {Operators} that are {Invertible} in},
     journal = {Canadian mathematical bulletin},
     pages = {141--146},
     year = {2011},
     volume = {54},
     number = {1},
     doi = {10.4153/CMB-2010-087-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2010-087-x/}
}