Bachem, Achim and Kern, Walter <br/><br/>
Linear programming duality; an introduction to oriented matroids  / 

 - Berlin:  Springer-Verlag,  1992 
 - 216p, Bibl. Index. 
<br/><br/><label>ISBN: </label>3540554173 
<br/><br/><label>Dewey Class. No.: </label>511.6  / B121.LP