Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1957_1_2_a1, author = {N. H. Kuiper}, title = {On $C^1$-isometric {imbeddings.~I}}, journal = {Matematika}, pages = {17--28}, publisher = {mathdoc}, volume = {1}, number = {2}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1957_1_2_a1/} }
N. H. Kuiper. On $C^1$-isometric imbeddings.~I. Matematika, Tome 1 (1957) no. 2, pp. 17-28. http://geodesic.mathdoc.fr/item/MAT_1957_1_2_a1/