@article{10_4064_sm209_2_1,
     author = {Osamu Hatori and Keiichi Watanabe},
     title = {Isometries between groups of invertible elements
 in $C^{*}$-algebras},
     journal = {Studia Mathematica},
     pages = {103--106},
     publisher = {mathdoc},
     volume = {209},
     number = {2},
     year = {2012},
     doi = {10.4064/sm209-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm209-2-1/}
}