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@article{MAN_1990__288_1_164727, author = {Xian Wu}, title = {On an infinitesimal invariant of normal.}, journal = {Mathematische Annalen}, pages = {121--132}, publisher = {mathdoc}, volume = {288}, number = {1}, year = {1990}, zbl = {0687.14006}, url = {http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164727/} }
Xian Wu. On an infinitesimal invariant of normal.. Mathematische Annalen, Tome 288 (1990) no. 1, pp. 121-132. http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164727/