| A fast accurate implicit polynomial fitting approach Recent countries visiting this post |  |
 | 10 | United States |
 | 5 | China |
 | 3 | |
 | 2 | Russian Federation |
 | 1 | Germany |
 | 1 | Japan |
| A fast accurate implicit polynomial fitting approach Recent countries visiting this post | |
| 10 | United States |
| 5 | China |
| 3 | |
| 2 | Russian Federation |
| 1 | Germany |
| 1 | Japan |