Fields of parallel vectors in non-analytic manifolds in the large
Compositio Mathematica, Tome 5 (1938), pp. 198-207. 
@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},
     pages = {198--207},
     publisher = {Johnson Reprint Corporation},
     volume = {5},
     year = {1938},
     zbl = {0018.23702},
     language = {en},
     url = {http://www.numdam.org/item/CM_1938__5__198_0/}
}
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%A Thomas, T. Y.
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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://www.numdam.org/item/CM_1938__5__198_0/