| A Network Optimization Model for Multi-layer IP/MPLS over OTN/DWDM Networks Recent countries visiting this post |  |
 | 10 | United States |
 | 1 | Australia |
 | 1 | Japan |
| A Network Optimization Model for Multi-layer IP/MPLS over OTN/DWDM Networks Recent countries visiting this post | |
| 10 | United States |
| 1 | Australia |
| 1 | Japan |