Brumfiel, G.W <br/><br/>
Partially ordered rings & semi-algebraic geometry 
G.W. Brumfiel 
 - Cambridge  Cambridge University Press  1979 
 - 280 
 - London mathematical society lecture note series 37 .
<br/><br/><label>ISBN: </label>052122845x 
<br/><br/><label>Dewey Class. No.: </label>2.05  / BRUM