@article{AMBP_2007__14_1_93_0, author = {Ishiwata, Satoshi}, title = {Discrete version of {Dungey{\textquoteright}s} proof for the gradient heat kernel estimate on coverings}, journal = {Annales math\'ematiques Blaise Pascal}, pages = {93--102}, publisher = {Annales math\'ematiques Blaise Pascal}, volume = {14}, number = {1}, year = {2007}, doi = {10.5802/ambp.229}, zbl = {1137.60033}, language = {en}, url = {http://www.numdam.org/articles/10.5802/ambp.229/} }