A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is application/pdf.
Morton M. Astrahan, Donald D. Chamberlin, W. Frank King, Irving L. Traiger. "System R: A relational data base management system." Lecture Notes in Computer Science (1976) 139-148