@Article{feautrier.or.88, 
 author
     =
     "Paul Feautrier", 
 title
     =
     "Parametric Integer Programming", 
 pages
     =
     "243--268", 
 journal
     =
     "Operations Research", 
 year
     =
     "1988", 
 volume
     =
     "22", 
 number
     =
     "3", 

}