1. E. Artin,Geometric Algebra, Interscience Publ., New York, London, 1957.
2. A. Borel,Introduction aux groupes arithmétiques, Publ. Inst. Math. Univ. Strasbourg XV, Hermann Paris, 1969.
3. J. S. Dani,Density properties of orbits under discrete groups, J. Indian Math. Soc.39 (1975), 189–218.
4. S. G. Dani,Kolmogorov automorphisms on homogeneous spaces, Amer. J. Math.98 (1976), 119–163.
5. S. G. Dani,Bernoullian translations and minimal horospheres on homogeneous spaces, J. Indian Math. Soc.40 (1976), 245–284.