%0 Journal Article %A Ciprian Foias %A Arthur E. Frazho %A Marinus A. Kaashoek %T Contractive liftings and the commutator %J Comptes Rendus. Mathématique %D 2002 %P 431-436 %V 335 %N 5 %I Elsevier %R 10.1016/S1631-073X(02)02508-6 %G en %F CRMATH_2002__335_5_431_0