| A New Document Placement Scheme for Cooperative Caching on the Internet Recent countries visiting this post |  |
 | 4 | United States |
 | 2 | |
 | 1 | Japan |
| A New Document Placement Scheme for Cooperative Caching on the Internet Recent countries visiting this post | |
| 4 | United States |
| 2 | |
| 1 | Japan |