Two are better than one: Fundamental parameters of frame coherence. Bajwa, W. U., Calderbank, R., & Mixon, D. G. Applied and Computational Harmonic Analysis, 33(1):58--78, 2012.
Two are better than one: Fundamental parameters of frame coherence [link]Paper  doi  bibtex   
@article{ Bajwa201258,
  author = {Bajwa, Waheed U. and Calderbank, Robert and Mixon, Dustin G.},
  doi = {10.1016/j.acha.2011.09.005},
  issn = {1063-5203},
  journal = {Applied and Computational Harmonic Analysis},
  keywords = {Frames; Worst-case coherence; Average coherence; Welch bound; Sparse signal processing},
  note = {},
  number = {1},
  pages = {58--78},
  title = {{Two are better than one: Fundamental parameters of frame coherence}},
  url = {http://www.sciencedirect.com/science/article/pii/S1063520311001047},
  volume = {33},
  x-fetchedfrom = {ScienceDirect},
  year = {2012}
}

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