| On Improving Pseudo-Relevance Feedback Using Pseudo-Irrelevant Documents Recent countries visiting this post |  |
 | 8 | United States |
 | 1 | |
 | 1 | France |
| On Improving Pseudo-Relevance Feedback Using Pseudo-Irrelevant Documents Recent countries visiting this post | |
| 8 | United States |
| 1 | |
| 1 | France |