Guoting Chen. Further Reduction of Normal Forms for Vector Fields. Numerical Algorithms, 27(1):1-33, 2001. [doi]
@article{Chen01-15, title = {Further Reduction of Normal Forms for Vector Fields}, author = {Guoting Chen}, year = {2001}, doi = {10.1023/A:1016693005645}, url = {http://dx.doi.org/10.1023/A:1016693005645}, researchr = {https://researchr.org/publication/Chen01-15}, cites = {0}, citedby = {0}, journal = {Numerical Algorithms}, volume = {27}, number = {1}, pages = {1-33}, }