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Champagne, B.; Hereman, W.; Winternitz, P. The computer calculation of Lie point symmetries of large systems of differential equations. (English) Zbl 0875.65079 Comput. Phys. Commun. 66, No. 2-3, 319-340 (1991). MSC: 65L99 34-04 68W30 34A25 PDFBibTeX XMLCite \textit{B. Champagne} et al., Comput. Phys. Commun. 66, No. 2--3, 319--340 (1991; Zbl 0875.65079) Full Text: DOI