@article{BorndoerferWeismantel2001, author = {Ralf Bornd{\"o}rfer and Robert Weismantel}, title = {Discrete Relaxations of Combinatorial Programs}, journal = {Discrete Appl. Math.}, volume = {112}, number = {1-3}, pages = {11 -- 26}, url = {http://opus.kobv.de/zib/volltexte/1997/324/}, year = {2001}, }