Gary W. Hansen, James V. Hansen Procedural and Non-Procedural Query Languages Revisited: A Comparison of Relational Algebra and Relational Calculus. [Citation Graph (2, 0)][DBLP] International Journal of Man-Machine Studies, 1987, v:26, n:6, pp:683-694 [Journal]
Gary W. Hansen, James V. Hansen Human Performance in Relational Algebra, Tuple Calculus, and Domain Calculus. [Citation Graph (0, 0)][DBLP] International Journal of Man-Machine Studies, 1988, v:29, n:5, pp:503-516 [Journal]
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