@article{10_4064_sm150_3_5,
     author = {C. Badea},
     title = {Perturbations of operators similar to contractions
and the commutator equation},
     journal = {Studia Mathematica},
     pages = {273--293},
     year = {2002},
     volume = {150},
     number = {3},
     doi = {10.4064/sm150-3-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm150-3-5/}
}