@article{GDZPPN002477777, title = {A Geometric Theory of Surface Area.}, journal = {Monatshefte f\"ur Mathematik}, volume = {76}, year = {1972}, pages = {66-77}, zbl = {0239.50002}, url = {http://dml.mathdoc.fr/item/GDZPPN002477777} }
Toralballa, L.V. A Geometric Theory of Surface Area.. Monatshefte für Mathematik, Tome 76 (1972) pp. 66-77. http://gdmltest.u-ga.fr/item/GDZPPN002477777/