| Indexing using a Spectral Encoding of Topological Structure Recent countries visiting this post |  |
 | 5 | United States |
 | 1 | Germany |
 | 1 | China |
 | 1 |
| Indexing using a Spectral Encoding of Topological Structure Recent countries visiting this post | |
| 5 | United States |
| 1 | Germany |
| 1 | China |
| 1 |