Cvetkovic, D et.al. <br/><br/>
Eigenspaces of Graphs   
by D Cvetkovic et.al. 
 - Cambridge  Cambridge University Press  2008 
 - xiii,258p 
 - Encyclopedia of Mathematics and its Applications No.66 .
<br/><br/><label>ISBN: </label>9780521057189 
<br/><br/><label>Dewey Class. No.: </label>511.5  / P081