@article{01780500, title = {A Morse lemma for degenerate critical points with low differentiability.}, journal = {Abstract and Applied Analysis}, volume = {5}, year = {2000}, pages = {113-118}, doi = {10.1155/S1085337500000245}, zbl = {1017.58007}, language = {en}, url = {http://dml.mathdoc.fr/item/01780500} }
De Moura, Adriano A.; De Souza, Fausto M. A Morse lemma for degenerate critical points with low differentiability.. Abstract and Applied Analysis, Tome 5 (2000) pp. 113-118. doi : 10.1155/S1085337500000245. http://gdmltest.u-ga.fr/item/01780500/