| A fundamental scalability criterion for data aggregation in VANETs Recent countries visiting this post |  |
 | 4 | United States |
 | 2 | |
 | 1 | Germany |
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| A fundamental scalability criterion for data aggregation in VANETs Recent countries visiting this post | |
| 4 | United States |
| 2 | |
| 1 | Germany |
| 1 | China |
| 1 | Russian Federation |