%0 Journal Article %A J. S. Caughman %A J. J. P. Veerman %T Kernels of directed graph Laplacians %J The electronic journal of combinatorics %D 2006 %V 13 %U http://geodesic.mathdoc.fr/articles/10.37236/1065/ %R 10.37236/1065 %F 10_37236_1065