Bachem, Achim. <br/><br/>
Linear programming duality :  an introduction to oriented matroids / 
Achim Bachem, Walter Kern. 
 - Berlin :  Springer-Verlag,  c1992. 
 - 216 p. 
<br/><br/><label>ISBN: </label>3540554173 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Linear programming.<br/>Matroids.