Ringel C.M. <br/><br/>
Same algebras and integral quadratic forms. 
Ringel C.M. 
 - Berlin  Springer-Verlag  1984 
 - 389 p. 
<br/><br/> MicroFiche. Lecture Notes in Mathematics, Vol. 1099 
<br/><br/><label>Dewey Class. No.: </label>MF