[1] O. Christensen, FRAMES AND BASES: An introductory Course, Birkhauser publication, 2008.
[2] V. K. Goyal, J. Kovacevic and A. J. Kelner, Quantised frame expansions with erasures., Appl. Comp. Harm. Anal., 10 (2000) 203–233.
[3] O. Christensen, An Introduction to Frames and Riesz Bases, Birkhauser publication, 2016.
[4] O. Christensen, Approximation Theory: From Taylor polynomials to wavelets, Birkhauser publication, 2006.
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