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@article{CM_1937__4__342_0, author = {Weatherburn, C. E.}, title = {On certain useful vectors in differential geometry}, journal = {Compositio Mathematica}, pages = {342--345}, publisher = {Johnson Reprint Corporation}, volume = {4}, year = {1937}, zbl = {0016.37202}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CM_1937__4__342_0/} }
Weatherburn, C. E. On certain useful vectors in differential geometry. Compositio Mathematica, Tome 4 (1937), pp. 342-345. http://geodesic.mathdoc.fr/item/CM_1937__4__342_0/