| Two-Dimensional Non-negative Matrix Factorization for Face Representation and Recognition Recent countries visiting this post |  |
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| Two-Dimensional Non-negative Matrix Factorization for Face Representation and Recognition Recent countries visiting this post | |
| 15 | United States |
| 3 | Russian Federation |
| 3 | Tunisia |
| 2 | |
| 1 | China |
| 1 | Korea, Republic of |