W. Casaca, G. Taubin, and L. Nonato. " Graph Laplacian for Spectral Clustering and Seeded Image Segmentation", in Anais do XXVIII Concurso de Teses e Dissertações, Recife, 2015, pp. 31-36, doi: https://doi.org/10.5753/ctd.2015.9998.