| A Dual Theory of Inverse and Forward Light Transport Recent countries visiting this post |  |
 | 10 | United States |
 | 2 | |
 | 1 | China |
 | 1 | Korea, Republic of |
 | 1 | Ukraine |
 | 1 | Russian Federation |
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| A Dual Theory of Inverse and Forward Light Transport Recent countries visiting this post | |
| 10 | United States |
| 2 | |
| 1 | China |
| 1 | Korea, Republic of |
| 1 | Ukraine |
| 1 | Russian Federation |
| 1 | Turkey |