1 January 2019 - 31 December 2019
| DOI | https://doi.org/10.48597/JZNQ-YSZ8 |
|---|---|
| Start time | 1 January 2019 |
| Stop time | 31 December 2019 |
| DOI | https://doi.org/10.48597/SP8X-9RJG |
|---|---|
| Start time | 1 January 2019 |
| Stop time | 15 April 2020 |
| DOI | https://doi.org/10.48597/QMWX-5S3D |
|---|---|
| Start time | 1 January 2019 |
| Stop time | 31 December 2019 |