@techreport{BorndoerferWeismantel1997, author = {Ralf Bornd{\"o}rfer and Robert Weismantel}, title = {Discrete Relaxations of Combinatorial Programs}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {SC-97-54}, language = {eng}, year = {1997} }