On topological Tits buildings and their classification

Burns, Keith; Spatzier, Ralf

Publications Mathématiques de l'IHÉS, Volume 65 (1987) p. 5-34

Manifolds of nonpositive curvature and their buildings

Burns, Keith; Spatzier, Ralf

Publications Mathématiques de l'IHÉS, Volume 65 (1987) p. 35-59