@article{GDZPPN002240289, title = {Zur Theorie des Kr\"ummungsmaasses, Von E. Beltrami in Bologna.}, journal = {Mathematische Annalen}, volume = {1}, year = {1869}, pages = {575-582}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN002240289} }
Beltrami, E. Zur Theorie des Krümmungsmaasses, Von E. Beltrami in Bologna.. Mathematische Annalen, Tome 1 (1869) pp. 575-582. http://gdmltest.u-ga.fr/item/GDZPPN002240289/