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Hummel, C; Lang, U; Schroeder, Viktor (2000). Convex hulls in singular spaces of negative curvature. Annals of Global Analysis and Geometry, 18(2):191-204.
Hummel, C; Schroeder, Viktor (1999). Tits geometry of cocompact real-analytic Hadamard manifolds of dimension 4. Differential Geometry and its Applications, 11(2):129-143.
Hummel, C; Schroeder, Viktor (1998). Tits geometry associated with 4-dimensional closed real-analytic manifolds of nonpositive curvature. Journal of Differential Geometry, 48(3):531-555.
Hummel, C; Schroeder, Viktor (1996). Cusp closing in rank one symmetric spaces. Inventiones Mathematicae, 123(2):283-307.