| A Spatiotemporal Approach for Secure Range Queries in Tiered Sensor Networks Recent countries visiting this post |  |
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| A Spatiotemporal Approach for Secure Range Queries in Tiered Sensor Networks Recent countries visiting this post | |
| 14 | United States |
| 12 | |
| 5 | Vietnam |
| 1 | Algeria |
| 1 | Russian Federation |
| 1 | China |