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3. T. DeMarco, Structured Analysis and System Specification. Yourdon Press, 1978
4. E. Yourdon and L. Constantine, Structured Design: Fundamentals of a Discipline of Computer Program and Systems Design. Yourdon Press, 1978
5. J. Baker, M. Brough and N. Matzke, Yourdon Reference Manual. (obtainable from CGI Systems), 1990