1. Orbits of linear algebraic groups;Birkes;Ann. Math.,1971
2. Groupes reductifs sur un corps local;Bruhat;Publ. IHES,1972
3. Decision procedures for real and p-adic fields;Cohen;Comm. Pure Appl. Math.,1969
4. Symmetric Bilinear Forms;Milnor,1973
5. J. Morgan and J.-P. Otal: (To appear).