@article{GDZPPN002478552, title = {A Geometric Theory of Surface Area. III.}, journal = {Monatshefte f\"ur Mathematik}, volume = {77}, year = {1973}, pages = {363-365}, zbl = {0276.50003}, url = {http://dml.mathdoc.fr/item/GDZPPN002478552} }
Toralballa, L.V. A Geometric Theory of Surface Area. III.. Monatshefte für Mathematik, Tome 77 (1973) pp. 363-365. http://gdmltest.u-ga.fr/item/GDZPPN002478552/