Finite-Dimensional Approximation of the Inverse Frame Operator. Ole Christensen — 2000 The journal of Fourier analysis and applications [[Elektronische Ressource]]
Pertubation of Operators and Applications to Frame Theory. Peter G. Cazassa; Ole Christensen — 1997 The journal of Fourier analysis and applications [[Elektronische Ressource]]
Marcos de traslaciones. Peter G. Casazza; Ole Christensen; Nigel J. Kalton — 2001 Collectanea Mathematica