Geodesic
On the Laplacian, signless Laplacian and normalized Laplacian characteristic polynomials of a graph
Czechoslovak Mathematical Journal, Tome 63 (2013) no. 3, pp. 701-720.

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The Laplacian, signless Laplacian and normalized Laplacian characteristic polynomials of a graph are the characteristic polynomials of its Laplacian matrix, signless Laplacian matrix and normalized Laplacian matrix, respectively. In this paper, we mainly derive six reduction procedures on the Laplacian, signless Laplacian and normalized Laplacian characteristic polynomials of a graph which can be used to construct larger Laplacian, signless Laplacian and normalized Laplacian cospectral graphs, respectively.
DOI : 10.1007/s10587-013-0048-7
Classification : 05C50
Keywords: Laplacian matrix; signless Laplacian matrix; normalized Laplacian matrix; characteristic polynomial 
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     title = {On the {Laplacian,} signless {Laplacian} and normalized {Laplacian} characteristic polynomials of a graph},
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Guo, Ji-Ming; Li, Jianxi; Shiu, Wai Chee. On the Laplacian, signless Laplacian and normalized Laplacian characteristic polynomials of a graph. Czechoslovak Mathematical Journal, Tome 63 (2013) no. 3, pp. 701-720. doi : 10.1007/s10587-013-0048-7. http://geodesic.mathdoc.fr/articles/10.1007/s10587-013-0048-7/

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