| Directed Model Checking for B: An Evaluation and New Techniques Recent countries visiting this post |  |
 | 8 | United States |
 | 4 | Brazil |
 | 3 | Netherlands |
 | 1 | |
 | 1 | Russian Federation |
| Directed Model Checking for B: An Evaluation and New Techniques Recent countries visiting this post | |
| 8 | United States |
| 4 | Brazil |
| 3 | Netherlands |
| 1 | |
| 1 | Russian Federation |