@article{GDZPPN002315440, title = {On the Moser Normal Form ata Non-Umbilic Point.}, journal = {Mathematische Annalen}, volume = {237}, year = {1978}, pages = {97-102}, zbl = {0358.32013}, url = {http://dml.mathdoc.fr/item/GDZPPN002315440} }
Webster, S.M. On the Moser Normal Form ata Non-Umbilic Point.. Mathematische Annalen, Tome 237 (1978) pp. 97-102. http://gdmltest.u-ga.fr/item/GDZPPN002315440/