| A fluid approximation for large-scale service systems Recent countries visiting this post |  |
 | 8 | United States |
 | 3 | China |
 | 1 | Germany |
 | 1 | Russian Federation |
 | 1 |
| A fluid approximation for large-scale service systems Recent countries visiting this post | |
| 8 | United States |
| 3 | China |
| 1 | Germany |
| 1 | Russian Federation |
| 1 |