1 January 1988 - 1 January 1991
| DOI | https://doi.org/10.48597/UTY8-RXVX |
|---|---|
| Start time | 1 January 1988 |
| Stop time | 1 January 1991 |
| DOI | https://doi.org/10.48597/K9U3-8RFW |
|---|---|
| Start time | 1 January 1983 |
| Stop time | 1 January 1991 |
| DOI | https://doi.org/10.48597/WRTD-95U7 |
|---|---|
| Start time | 1 January 1983 |
| Stop time | 1 January 1990 |
| DOI | https://doi.org/10.48597/DMGY-6BHV |
|---|---|
| Start time | 1 January 1983 |
| Stop time | 1 January 1989 |
| DOI | https://doi.org/10.48597/4ZTK-WAHJ |
|---|---|
| Start time | 1 January 1983 |
| Stop time | 1 January 1984 |