@article{1183510611, author = {Busemann, Herbert}, title = {Two-dimensional geometries with elementary areas}, journal = {Bull. Amer. Math. Soc.}, volume = {53}, number = {12}, year = {1947}, pages = { 402-407}, language = {en}, url = {http://dml.mathdoc.fr/item/1183510611} }
Busemann, Herbert. Two-dimensional geometries with elementary areas. Bull. Amer. Math. Soc., Tome 53 (1947) no. 12, pp. 402-407. http://gdmltest.u-ga.fr/item/1183510611/