@article{1183494162, author = {Michal, A. D.}, title = {Geodesic coordinates of order $r$}, journal = {Bull. Amer. Math. Soc.}, volume = {36}, number = {11}, year = {1930}, pages = { 541-546}, language = {en}, url = {http://dml.mathdoc.fr/item/1183494162} }
Michal, A. D. Geodesic coordinates of order $r$. Bull. Amer. Math. Soc., Tome 36 (1930) no. 11, pp. 541-546. http://gdmltest.u-ga.fr/item/1183494162/