Phyllis Reisner, Raymond F. Boyce, Donald D. Chamberlin. Human factors evaluation of two data base query languages: SQUARE and SEQUEL. In American Federation of Information Processing Societies: 1975 National Computer Conference, 19-22 May 1975, Anaheim, CA, USA. Volume 44 of AFIPS Conference Proceedings, pages 447-452, AFIPS Press, 1975. [doi]
Abstract is missing.