TY - JOUR AU - Clara E. Brasseur AU - Ryan E. Grady AU - Stratos Prassidis TI - Coverings, Laplacians, and heat kernels of directed graphs JO - The electronic journal of combinatorics PY - 2009 VL - 16 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.37236/120/ DO - 10.37236/120 ID - 10_37236_120 ER -