@article{GDZPPN002063662, title = {Smooth solutions of the heat and wave equations.}, journal = {Commentarii mathematici Helvetici}, volume = {55}, year = {1980}, pages = {1-12}, zbl = {0439.35017}, url = {http://dml.mathdoc.fr/item/GDZPPN002063662} }
Smale, Stephen. Smooth solutions of the heat and wave equations.. Commentarii mathematici Helvetici, Tome 55 (1980) pp. 1-12. http://gdmltest.u-ga.fr/item/GDZPPN002063662/