@article{1178240693, author = {Sakamoto, Kunio}, title = {Planar geodesic immersions}, journal = {Tohoku Math. J. (2)}, volume = {29}, number = {4}, year = {1977}, pages = { 25-56}, language = {en}, url = {http://dml.mathdoc.fr/item/1178240693} }
Sakamoto, Kunio. Planar geodesic immersions. Tohoku Math. J. (2), Tome 29 (1977) no. 4, pp. 25-56. http://gdmltest.u-ga.fr/item/1178240693/