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@article{CMH_1980__55_139810, author = {Stephen Smale}, title = {Smooth solutions of the heat and wave equations.}, journal = {Commentarii mathematici Helvetici}, pages = {1--12}, publisher = {mathdoc}, volume = {55}, year = {1980}, zbl = {0439.35017}, url = {http://geodesic.mathdoc.fr/item/CMH_1980__55_139810/} }
Stephen Smale. Smooth solutions of the heat and wave equations.. Commentarii mathematici Helvetici, Tome 55 (1980), pp. 1-12. http://geodesic.mathdoc.fr/item/CMH_1980__55_139810/