1. Séminaire sur la classification des groupes de Lie algébriques;Chevalley,1956
2. The Algebraic Theory of Semigroups;Clifford,1961
3. Observable groups and Hubert's fourteenth problem;Grosshans;Amer. J. Math,1973
4. The variety of points which are not semi-stable;Grosshans;Illinois J. Math,1982
5. Geometry of Coxeter Groups;Hiller,1982