Hua, D. D.; Cairó, L.; Feix, M. R. Time-independent invariants of motion for the quadratic system. (English) Zbl 0822.34008 J. Phys. A, Math. Gen. 26, No. 23, 7097-7114 (1993). MSC: 34A25 70H25 34C25 34D05 34A05 PDF BibTeX XML Cite \textit{D. D. Hua} et al., J. Phys. A, Math. Gen. 26, No. 23, 7097--7114 (1993; Zbl 0822.34008) Full Text: DOI OpenURL
Bouquet, S. E.; Feix, M. R.; Leach, P. G. L. Properties of second-order ordinary differential equations invariant under time translation and self-similar transformation. (English) Zbl 0734.34029 J. Math. Phys. 32, No. 6, 1480-1490 (1991). MSC: 34C20 34C05 34D05 34A25 34A34 PDF BibTeX XML Cite \textit{S. E. Bouquet} et al., J. Math. Phys. 32, No. 6, 1480--1490 (1991; Zbl 0734.34029) Full Text: DOI OpenURL