Johnson, Ellis L <br/><br/>
Integer Programming: Facets, Subadditivity, and Duality for Group and Semi-Group Problems (e-book) 

 -  SIAM   
 - 79p 
 - CBMS-NSF Regional Conference Series in Applied Mathematics .
<br/><br/> http://portal.igpublish.com/iglibrary/search/SIAMB0000187.main.html?13 
<br/><br/><label>ISBN: </label>9780898711622 
<br/><br/><label>Subjects--Index Terms: </label>Integer programming; Group theory; Semigroups. 
<br/><br/><label>Dewey Class. No.: </label>519.77  / (e-book)