1 January 2018 - 1 January 2022
| DOI | https://doi.org/10.48597/7NTY-VC4G |
|---|---|
| Start time | 1 January 2018 |
| Stop time | 1 January 2022 |
| Valid since | 24 October 2025 10:57:20 |
| DOI | https://doi.org/10.48597/7NTY-VC4G |
|---|---|
| Start time | 1 January 2018 |
| Stop time | 1 January 2022 |
| Valid since | 24 October 2025 10:57:20 |
| DOI | https://doi.org/10.48597/RG29-WG2Z |
|---|---|
| Start time | 1 January 2018 |
| Stop time | 1 January 2021 |
| Valid from | 24 October 2025 10:57:13 |
| Valid to | 24 October 2025 10:57:20 |
| DOI | https://doi.org/10.48597/GQ43-992K |
|---|---|
| Start time | 1 January 2018 |
| Stop time | 1 January 2020 |
| Valid from | 24 October 2025 10:57:07 |
| Valid to | 24 October 2025 10:57:13 |
| DOI | https://doi.org/10.48597/787E-NNP7 |
|---|---|
| Start time | 1 January 2018 |
| Stop time | 1 January 2019 |
| Valid from | 24 October 2025 10:57:02 |
| Valid to | 24 October 2025 10:57:07 |