Summary
Peter G. Casazza, Ole Christensen, Shidong Li, Alex and er Lindner (2006) Density results for frames of exponentials. In Harmonic analysis and applications, 359–369. . Birkhauser Boston, Boston, MA 
Bibtex entry
@INCOLLECTION { MR2249317,
AUTHOR = { Peter G. Casazza and Ole Christensen and Shidong Li and Alexander Lindner },
TITLE = { Density results for frames of exponentials },
BOOKTITLE = { Harmonic analysis and applications },
SERIES = { Appl. Numer. Harmon. Anal. },
PAGES = { 359--369 },
PUBLISHER = { Birkhauser Boston, Boston, MA },
YEAR = { 2006 },
MRCLASS = { 42C15 (42C30) },
MRNUMBER = { 2249317 (2007d:42052) },
DOI = { 10.1007/0-8176-4504-7_16 },
URL = { http://dx.doi.org/10.1007/0-8176-4504-7_16 },
}