@article{GDZPPN00247722X, title = {A Geometric Theory of Surface Area.}, journal = {Monatshefte f\"ur Mathematik}, volume = {74}, year = {1970}, pages = {462-476}, zbl = {0224.50002}, url = {http://dml.mathdoc.fr/item/GDZPPN00247722X} }
Toralballa, L.V. A Geometric Theory of Surface Area.. Monatshefte für Mathematik, Tome 74 (1970) pp. 462-476. http://gdmltest.u-ga.fr/item/GDZPPN00247722X/