| Article ID: | iaor20124337 |
| Volume: | 63 |
| Issue: | 7 |
| Start Page Number: | 1018 |
| End Page Number: | 1020 |
| Publication Date: | Jul 2012 |
| Journal: | Journal of the Operational Research Society |
| Authors: | Janiak A, Kovalyov M Y |
| Keywords: | combinatorial optimization |
Bachman and Janiak provided a sketch of the proof that the problem 1∣