@article{AIF_1973__23_2_163_0, author = {Takens, Floris}, title = {Normal forms for certain singularities of vectorfields}, journal = {Annales de l'Institut Fourier}, pages = {163--195}, publisher = {Institut Fourier}, address = {Grenoble}, volume = {23}, number = {2}, year = {1973}, doi = {10.5802/aif.467}, zbl = {0266.34046}, mrnumber = {51 #1872}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.467/} }