David K. Hammond Yaniv Gur Chris R. Johnson 0001 Graph diffusion distance: A difference measure for weighted graphs based on the graph Laplacian exponential kernel. 419-422 2013 GlobalSIP https://doi.org/10.1109/GlobalSIP.2013.6736904 conf/globalsip/2013 db/conf/globalsip/globalsip2013.html#HammondGJ13