Sanders, Jan A.; Wang, Jing Ping On recursion operators. (English) Zbl 0972.35137 Physica D 149, No. 1-2, 1-10 (2001). MSC: 35Q53 37K05 37K30 PDFBibTeX XMLCite \textit{J. A. Sanders} and \textit{J. P. Wang}, Physica D 149, No. 1--2, 1--10 (2001; Zbl 0972.35137) Full Text: DOI
Cushman, R.; Sanders, J. A.; White, N. Normal form for the (2;n)-nilpotent vector field, using invariant theory. (English) Zbl 0649.34053 Physica D 30, No. 3, 399-412 (1988). MSC: 37-XX 34A34 PDFBibTeX XMLCite \textit{R. Cushman} et al., Physica D 30, No. 3, 399--412 (1988; Zbl 0649.34053) Full Text: DOI