| Adapting the wavefront expansion in presence of strong currents Recent countries visiting this post |  |
 | 8 | United States |
 | 3 | Russian Federation |
 | 1 | Canada |
 | 1 |
| Adapting the wavefront expansion in presence of strong currents Recent countries visiting this post | |
| 8 | United States |
| 3 | Russian Federation |
| 1 | Canada |
| 1 |