TY - JOUR AU - Fan Chung AU - S.-T. Yau TI - Coverings, heat kernels and spanning trees JO - The electronic journal of combinatorics PY - 1999 VL - 6 UR - http://geodesic.mathdoc.fr/articles/10.37236/1444/ DO - 10.37236/1444 ID - 10_37236_1444 ER -