@article{CM_1938__5__198_0, author = {Mayer, W. and Thomas, T. Y.}, title = {Fields of parallel vectors in non-analytic manifolds in the large}, journal = {Compositio Mathematica}, volume = {5}, year = {1938}, pages = {198-207}, zbl = {0018.23702}, language = {en}, url = {http://dml.mathdoc.fr/item/CM_1938__5__198_0} }
Mayer, W.; Thomas, T. Y. Fields of parallel vectors in non-analytic manifolds in the large. Compositio Mathematica, Tome 5 (1938) pp. 198-207. http://gdmltest.u-ga.fr/item/CM_1938__5__198_0/