Levi, Decio Lie symmetries for lattice equations. (English) Zbl 1195.37048 Note Mat. 23(2004-2005), No. 2, 139-156 (2005). MSC: 37K60 37K35 39A12 PDFBibTeX XMLCite \textit{D. Levi}, Note Mat. 23, No. 2, 139--156 (2005; Zbl 1195.37048) Full Text: DOI
Alsina, C.; Schweizer, B. On a theorem of Mouchtari and Serstnev. (English) Zbl 0488.60018 Note Mat. 1, No. 1, 19-24 (1981). Reviewer: R. Tardiff MSC: 60B99 39B99 PDFBibTeX XMLCite \textit{C. Alsina} and \textit{B. Schweizer}, Note Mat. 1, No. 1, 19--24 (1981; Zbl 0488.60018) Full Text: DOI