| Solving Periodic Timetable Optimisation Problems by Modulo Simplex Calculations Recent countries visiting this post |  |
 | 8 | United States |
 | 5 | Germany |
 | 1 | Japan |
 | 1 | |
 | 1 | Brazil |
| Solving Periodic Timetable Optimisation Problems by Modulo Simplex Calculations Recent countries visiting this post | |
| 8 | United States |
| 5 | Germany |
| 1 | Japan |
| 1 | |
| 1 | Brazil |