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Caprace, Pierre-Emmanuel; Monod, Nicolas Isometry groups of non-positively curved spaces: discrete subgroups. (English) Zbl 1187.53037 J. Topol. 2, No. 4, 701-746 (2009). MSC: 53C20 20F65 53C24 22E40 57S99 PDFBibTeX XMLCite \textit{P.-E. Caprace} and \textit{N. Monod}, J. Topol. 2, No. 4, 701--746 (2009; Zbl 1187.53037) Full Text: DOI arXiv