| Service Charge and Energy-Aware Vertical Handoff in Integrated IEEE 802.16e/802.11 Networks Recent countries visiting this post |  |
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| Service Charge and Energy-Aware Vertical Handoff in Integrated IEEE 802.16e/802.11 Networks Recent countries visiting this post | |
| 4 | United States |
| 1 | |
| 1 | Germany |