1. Geometric Algebra;Artin,1957
2. Hardy–Littlewood varieties and semisimple groups;Borovoi;Invent. Math.,1995
3. Rational Quadratic Forms;Cassels,1978
4. Sphere Packings, Lattices and Groups;Conway,1993
5. Analytic Methods for Diophantine Equations and Diophantine Inequalities;Davenport,1962