. "Laplacian" . . "laplacian" . "combinatorial Laplacian matrix" . "Laplacian matrix" . "combinatorial Laplacian" . . . "graph Laplacians" . . "graph Laplacian" . . "graph laplacian" . . "Laplacians" . . "Laplacian of a directed, weighted graph" . . "Laplacian matrix normalization" . . "Laplacian matrices" . "Laplacian matrix" . . "Kirchhoff matrix" . "symmetric normalized Laplacian" . . .