| Source location problem with flow requirements in directed netwokrs | 12 | 0.95 | 2003 |
| Source location problems considering vertex-connectivity and edge-connectivity simultaneously | 9 | 0.68 | 2002 |
| Location Problems Based on Node-Connectivity and Edge-Connectivity between Nodes and Node-Subsets | 5 | 0.68 | 2000 |
