| Holistic Approach for Future Energy Efficient Cellular Networks Recent countries visiting this post |  |
 | 3 | United States |
 | 2 | Russian Federation |
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| Holistic Approach for Future Energy Efficient Cellular Networks Recent countries visiting this post | |
| 3 | United States |
| 2 | Russian Federation |
| 1 | |
| 1 | Taiwan |
| 1 | China |