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Integral quadratic forms : applications to algebraic geometry Igor Dolgachev (1982/1983) Séminaire Bourbaki
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Invariant Measures and Orbit Closures for Unipotent Action on Homogeneous Spaces (Survey). M. Ratner (1994) Geometric and functional analysis
Invariant measures for actions of unipotent groups over local fields on homogeneous spaces. G.A. Margulis, G.M. Tomanov (1994) Inventiones mathematicae
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Isoperimetric Inequalities for Lattices in Semisimple Lie Groups of Rank 2. E. Leuzinger, C. Pittet (1996) Geometric and functional analysis