@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/