@article{CRMATH_2002__335_5_431_0,
     author = {Foias, Ciprian and Frazho, Arthur E. and Kaashoek, Marinus A.},
     title = {Contractive liftings and the commutator},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {431--436},
     publisher = {Elsevier},
     volume = {335},
     number = {5},
     year = {2002},
     doi = {10.1016/S1631-073X(02)02508-6},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/S1631-073X(02)02508-6/}
}