1. Chen, Y., Jensen, C.D., Gray, E., Seigneur, J.M.: Risk Probability Estimating Based on Clustering, Technical Report No. TCD-CS-2003-17, Trinity College Dublin (2003)
2. Cvetković, D.: Signless Laplacians and line graphs. Bull. Acad. Serbe Sci. Arts, Cl. Sci. Math. Natur., Sci. Math. 131(30), 85–92 (2005)
3. Deepak, V., Meila, M.: Comparison of Spectral Clustering Methods. UW TR CSE-03-05-01 (2003)
4. Elon, Y.: Eigenvectors of the discrete Laplacian on regular graphs a statistical approach. J. Phys. A: Math. Theor. 41 (2008)
5. Fischer, I., Poland, J.: Amplifying the Block Matrix Structure for Spectral Clustering. Technical Report No. IDSIA-03-05, Telecommunications Lab (2005)