Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1967__26_1_115006, author = {Guenther, R.B.}, title = {A lower bound for fundamental solutions for parabolic equations}, journal = {Portugaliae mathematica}, pages = {93--100}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1967}, mrnumber = {0249830}, zbl = {0169.43602}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_115006/} }
Guenther, R.B. A lower bound for fundamental solutions for parabolic equations. Portugaliae mathematica, Tome 26 (1967) no. 1, pp. 93-100. http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_115006/