@article{1259943864, author = {D. LUDDEN, Gerald}, title = {The prolongation of the holonomy group}, journal = {J. Math. Soc. Japan}, volume = {20}, number = {4}, year = {1968}, pages = { 634-637}, language = {en}, url = {http://dml.mathdoc.fr/item/1259943864} }
D. LUDDEN, Gerald. The prolongation of the holonomy group. J. Math. Soc. Japan, Tome 20 (1968) no. 4, pp. 634-637. http://gdmltest.u-ga.fr/item/1259943864/