| Article ID: | iaor19971777 |
| Country: | Netherlands |
| Volume: | 72 |
| Issue: | 3 |
| Start Page Number: | 607 |
| End Page Number: | 609 |
| Publication Date: | Feb 1994 |
| Journal: | European Journal of Operational Research |
| Authors: | Labb M., Barros A.I. |
Unlike the Uncapacitated Facility Location Problem submodularity does not hold for the Multi-Level Uncapacitated Facility Location Problem. This point needs to be clarified as submodularity is assumed in some published papers and may lead to erroenous procedures to tackle the problem. Note: This article was previously published in the European Journal of Operational Research Vol. 71 nr. 1, but unfortunately several errors were not corrected before final printing, for whch the European Journal of Operational Research offers its apologies. To give the authors full credit we herewith print the correct version of the article as it was received. (see IAOR 62297)