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