books.google.com - This book introduces recent developments in the study of algebras defined by quadratic relations. One of the main problems in the study of these (and similarly defined) algebras is how to control their size. A central notion in solving this problem is the notion of a Koszul algebra, which was introduced...http://books.google.com/books/about/Quadratic_Algebras_Clifford_Algebras_and.html?id=5_ZrCKU4NpAC&utm_source=gb-gplus-shareQuadratic Algebras, Clifford Algebras, and Arithmetic Witt Groups

Get this book in print
## Quadratic Algebras, Clifford Algebras, and Arithmetic Witt GroupsBy Alexander Polishchuk, Leonid Positselski |