TY - JOUR A1 - Grötschel, Martin T1 - On the monotone symmetric travelling salesman problem T2 - Mathematics of Operations Research Y1 - 1980 UR - https://opus4.kobv.de/opus4-zib/frontdoor/index/index/docId/3013 VL - 5 IS - 2 SP - 285 EP - 292 ER -