@incollection{JEDP_1995____A3_0, author = {Davies, E. Brian}, title = {Heat kernel bounds for higher order elliptic operators}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {3}, pages = {1--11}, publisher = {Ecole polytechnique}, year = {1995}, mrnumber = {96i:35020}, zbl = {0994.58011}, language = {en}, url = {http://www.numdam.org/item/JEDP_1995____A3_0/} }