@article{SE_1957-1958__1__A6_0, author = {Willmore, T. J.}, title = {Generalized torsional derivation}, journal = {S\'eminaire de topologie et g\'eom\'etrie diff\'erentielle}, note = {talk:17}, pages = {1--12}, publisher = {Secr\'etariat math\'ematique}, volume = {1}, year = {1957-1958}, mrnumber = {121730}, zbl = {0134.39801}, language = {en}, url = {http://www.numdam.org/item/SE_1957-1958__1__A6_0/} }
Willmore, T. J. Generalized torsional derivation. Séminaire de topologie et géométrie différentielle, Tome 1 (1957-1958), Exposé no. 17, 12 p. http://www.numdam.org/item/SE_1957-1958__1__A6_0/
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