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| License |
|---|
| ACS AuthorChoice [2] |
| ACS AuthorChoice License [9] |
| CC BY 2.0 UK [1] |
| CC BY 2.0 Unported [57] |
| CC BY 3.0 DE [244] |
| CC BY 3.0 IGO [2] |
| CC BY 3.0 Unported [177] |
| CC BY 4.0 Unported [1351] |
| CC BY-NC 2.0 UK [2] |
| CC BY-NC 2.0 Unported [4] |
| CC BY-NC 2.5 Unported [5] |
| CC BY-NC 3.0 DE [7] |
| CC BY-NC 3.0 Unported [92] |
| CC BY-NC 4.0 Unported [107] |
| CC BY-NC-ND 3.0 DE [14] |
| CC BY-NC-ND 3.0 Unported [223] |
| CC BY-NC-ND 4.0 Unported [235] |
| CC BY-NC-SA 3.0 Unported [9] |
| CC BY-NC-SA 4.0 Unported [9] |
| CC BY-ND 3.0 DE [2] |
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