| State transition, balancing, station keeping, and yaw control for a dynamically stable single spherical wheel mobile robot Recent countries visiting this post |  |
 | 6 | United States |
 | 1 | Germany |
| State transition, balancing, station keeping, and yaw control for a dynamically stable single spherical wheel mobile robot Recent countries visiting this post | |
| 6 | United States |
| 1 | Germany |