@article{1103034176, author = {Busemann, Herbert}, title = {Length-preserving maps.}, journal = {Pacific J. Math.}, volume = {14}, number = {4}, year = {1964}, pages = { 457-477}, language = {en}, url = {http://dml.mathdoc.fr/item/1103034176} }
Busemann, Herbert. Length-preserving maps.. Pacific J. Math., Tome 14 (1964) no. 4, pp. 457-477. http://gdmltest.u-ga.fr/item/1103034176/