TY - JOUR A1 - Borndörfer, Ralf A1 - Weismantel, Robert T1 - Discrete Relaxations of Combinatorial Programs JF - Discrete Appl. Math. Y1 - 2001 UR - http://opus.kobv.de/zib/volltexte/1997/324/ VL - 112 IS - 1–3 SP - 11 EP - 26 ER -