More early history about System R, DB2, and some related systems here:
The 1995 SQL Reunion: People, Projects, and Politics https://mcjones.org/System_R/SQL_Reunion_95/
The 1995 SQL Reunion: People, Projects, and Politics https://mcjones.org/System_R/SQL_Reunion_95/
- CJ Date: https://www.computerhistory.org/collections/catalog/10265816...
- Don Chamberlin: https://www.computerhistory.org/collections/catalog/10270211...