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| doi = 10.2307/1971195 | jstor = 1971195 }}.</ref>
Another important source of cospectral graphs are the point-collinearity graphs and the line-intersection graphs of [[incidence geometry|point-line geometries]]. These graphs are always cospectral but are often non-isomorphic.<ref>See {{
==Cheeger inequality==
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==External links==
* {{cite web| first1=Andries |last1=Brouwer| first2 = Willem H. | last2 = Haemers| author-link = Andries Brouwer| url=http://www.win.tue.nl/~aeb/2WF02/spectra.pdf |title=Spectra of Graphs |year=2011 |ref =harv}}
* {{cite web| first1=Daniel |last1=Spielman |authorlink =Daniel Spielman |url=http://www.cs.yale.edu/~spielman/PAPERS/SGTChapter.pdf |title=Spectral Graph Theory |year=2011}} [chapter from Combinatorial Scientific Computing]
* {{cite web| first1=Daniel |last1=Spielman |url=http://cs-www.cs.yale.edu/homes/spielman/sgta/ |title=Spectral Graph Theory and its Applications |year=2007}} [presented at FOCS 2007 Conference]
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