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@article{IM_1975__29_142340, author = {Harold Donnelly}, title = {Heat {Equation} and the {Volume} of {Tubes.}}, journal = {Inventiones mathematicae}, pages = {239--244}, publisher = {mathdoc}, volume = {29}, year = {1975}, zbl = {0293.35035}, url = {http://geodesic.mathdoc.fr/item/IM_1975__29_142340/} }
Harold Donnelly. Heat Equation and the Volume of Tubes.. Inventiones mathematicae, Tome 29 (1975), pp. 239-244. http://geodesic.mathdoc.fr/item/IM_1975__29_142340/