@article{GDZPPN002091887, title = {Heat Equation and the Volume of Tubes.}, journal = {Inventiones mathematicae}, volume = {29}, year = {1975}, pages = {239-244}, zbl = {0293.35035}, url = {http://dml.mathdoc.fr/item/GDZPPN002091887} }
Donnelly, Harold. Heat Equation and the Volume of Tubes.. Inventiones mathematicae, Tome 29 (1975) pp. 239-244. http://gdmltest.u-ga.fr/item/GDZPPN002091887/