1. Spectral extrema for graphs: the Zarankiewicz problem;Babai;Electron. J. Combin.,2009
2. Design Theory, vol. I;Beth,1999
3. Modern Graph Theory;Bollobás,1998
4. Spectral theory of graphs based on the signless Laplacian;Cvetković,2010
5. Infinite families of Q-integral graphs;de Freitas;Linear Algebra Appl.,2010