| Multiple Variable Neighborhood Search Enriched with ILP Techniques for the Periodic Vehicle Routing Problem with Time Windows Recent countries visiting this post |  |
 | 4 | United States |
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| Multiple Variable Neighborhood Search Enriched with ILP Techniques for the Periodic Vehicle Routing Problem with Time Windows Recent countries visiting this post | |
| 4 | United States |
| 1 | |
| 1 | Singapore |