@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/