%0 Journal Article %A Peter G. Cazassa %A Ole Christensen %T Pertubation of Operators and Applications to Frame Theory. %J The journal of Fourier analysis and applications [[Elektronische Ressource]] %D 1997 %P 543-558 %V 3 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/JFAA_1997__3_6_59524/ %G en %F JFAA_1997__3_6_59524