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Cash, G.G., Gutman, I.: The Laplacian permanental polynomial: formulas and algorithms. MATCH
Commun. Math. Comput. Chem. 51, 129¨C136 (2004)
Gutman, I.: Relation between the Laplacian and the ordinary characteristic polynomial. MATCH
Commun. Math. Comput. Chem. 47, 133¨C140 (2003)

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