@article{10_4064_sm200_2_4,
     author = {Julio Ben{\'\i}tez and Vladimir Rako\v{c}evi\'c},
     title = {Invertibility of the commutator of an element
 in a $C^*$-algebra and its {Moore{\textendash}Penrose} inverse},
     journal = {Studia Mathematica},
     pages = {163--174},
     year = {2010},
     volume = {200},
     number = {2},
     doi = {10.4064/sm200-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm200-2-4/}
}