| A Graph-with-Loop Structure for a Topological Representation of 3D Objects Recent countries visiting this post |  |
 | 1 | China |
 | 1 | United States |
 | 1 | Russian Federation |
| A Graph-with-Loop Structure for a Topological Representation of 3D Objects Recent countries visiting this post | |
| 1 | China |
| 1 | United States |
| 1 | Russian Federation |