@article{10_4064_sm221_1_4,
     author = {Osamu Hatori},
     title = {Isometries of the unitary groups in $C^{*}$-algebras},
     journal = {Studia Mathematica},
     pages = {61--86},
     year = {2014},
     volume = {221},
     number = {1},
     doi = {10.4064/sm221-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm221-1-4/}
}