| A balancing approach to the realization of systems with internal passivity and reciprocity Recent countries visiting this post |  |
 | 7 | United States |
 | 4 | |
 | 1 | Russian Federation |
| A balancing approach to the realization of systems with internal passivity and reciprocity Recent countries visiting this post | |
| 7 | United States |
| 4 | |
| 1 | Russian Federation |