@article{GDZPPN002295296, title = {Invariant Metrics.}, journal = {Mathematische Annalen}, volume = {161}, year = {1965}, pages = {89-91}, language = {en}, url = {http://dml.mathdoc.fr/item/GDZPPN002295296} }
Nakano, H. Invariant Metrics.. Mathematische Annalen, Tome 161 (1965) pp. 89-91. http://gdmltest.u-ga.fr/item/GDZPPN002295296/