We determine the signless Laplacian spectrum for the \( H \)-join of regular graphs \( G_1, \ldots, G_p \). We also find an expression and upper bounds for the signless Laplacian spread of the \( H \)-join of regular graphs \( G_1, \ldots, G_p \).
Jing Li, Bo Zhou. On Signless Laplacian Spectra of \(H\)-joins[J], Journal of Combinatorial Mathematics and Combinatorial Computing, Volume 100. 113-123. DOI: .