@article{BorndoerferWeismantel2000, author = {Ralf Bornd{\"o}rfer and Robert Weismantel}, title = {Set Packing Relaxations of Some Integer Programs}, journal = {Math. Programming}, volume = {88}, pages = {425 -- 450}, url = {http://opus.kobv.de/zib/volltexte/1997/300/}, year = {2000}, language = {en} }