@article{JFAA_1997__3_6_59524,
     author = {Peter G. Cazassa and Ole Christensen},
     title = {Pertubation of {Operators} and {Applications} to {Frame} {Theory.}},
     journal = {The journal of Fourier analysis and applications},
     pages = {543--558},
     year = {1997},
     volume = {3},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JFAA_1997__3_6_59524/}
}