@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/