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2. The programming language pascal
3. O.-J. Dahl E. W. Dijkstra and C. A. R. Hoare Structured Programming Academic Press 1972. O.-J. Dahl E. W. Dijkstra and C. A. R. Hoare Structured Programming Academic Press 1972.
4. On the criteria to be used in decomposing systems into modules
5. Programming with abstract data types