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A generalization of Fiedler's lemma and the spectra of H-join of graphs. (arXiv:2008.12313v1 [math.CO]) http://arxiv.org/abs/2008.12313
A generalization of Fiedler's lemma and the spectra of H-join of graphs. (arXiv:2008.12313v1 [math.CO]) http://arxiv.org/abs/2008.12313