MathSciNet bibliographic data MR2821442 20F67 (20F65 57M07) Sageev, Michah; Wise, Daniel T. Periodic flats in ${\rm CAT}(0)$${\rm CAT}(0)$ cube complexes. Algebr. Geom. Topol. 11 (2011), no. 3, 1793–1820. Article

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