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W.W. Wadge, Programming Constructs for Nonprocedural Languages (March 1, 1978).
In this paper how a pure denotative (nonprocedural) language based on the lambda calculus can be provided with purely denotative analogs of the various constructs - such as while loops, blocks, case statements and the like - of conventional imperative structured programming languages. They can be simulated quite adequately using only two simple tools: phrases, which are compound expressions not unlike blocks, and pronouns, special variables not unlike keywords between which certain relationships are 'understood' to hold.