| A hierarchy of LMI inner approximations of the set of stable polynomials Recent countries visiting this post |  |
 | 3 | United States |
 | 3 | |
 | 1 | Italy |
| A hierarchy of LMI inner approximations of the set of stable polynomials Recent countries visiting this post | |
| 3 | United States |
| 3 | |
| 1 | Italy |