| A Kruskal-Based Heuristic for the Rooted Delay-Constrained Minimum Spanning Tree Problem Recent countries visiting this post |  |
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| A Kruskal-Based Heuristic for the Rooted Delay-Constrained Minimum Spanning Tree Problem Recent countries visiting this post | |
| 4 | United States |
| 3 | China |
| 1 | India |