johnmyleswhite/Graphs.jl — pull request #18 by andrioni (2013-04-06 01:36:13+00:00)
Title: Signless Laplacian matrix

The signless Laplacian matrix is a slightly different version of the
Laplacian matrix and is used in some parts of spectral graph theory.
http://dx.doi.org/10.1016/j.laa.2007.01.009 describes it.