@article{1183525021, author = {Widder, D. V.}, title = {Positive solutions of the heat equation}, journal = {Bull. Amer. Math. Soc.}, volume = {69}, number = {4}, year = {1963}, pages = { 111-112}, language = {en}, url = {http://dml.mathdoc.fr/item/1183525021} }
Widder, D. V. Positive solutions of the heat equation. Bull. Amer. Math. Soc., Tome 69 (1963) no. 4, pp. 111-112. http://gdmltest.u-ga.fr/item/1183525021/