MathSciNet bibliographic data

MR1638057 (99j:53058) 53C23 (53C20) Hummel, Christoph; Schroeder, Viktor Tits geometry associated with $4$-dimensional closed real-analytic manifolds of nonpositive curvature. J. Differential Geom. 48 (1998), no. 3, 531--555.

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