1. G. Butler, P.D. Grogono, R. Shinghal, and I.A. Tjandra. Retrieving information from data flow diagrams. In Proceedings of Second Working Conference on Reverse Engineering, (Toronto, July 14–16, 1995). Linda Wills, Philip Newcomb, Elliot Chikofsky (eds), IEEE Computer Society Press, Los Alamitos, CA, 1995,pp. 22–29.
2. G. Butler, P.D. Grogono, R. Shinghal, and I.A. Tjandra. Analyzing the logical structure of data flow diagrams. In Third International Conference on Document Analysis and Recognition, August 1995. Poster session.
3. G. Butler, P.D. Grogono, R. Shinghal, and I.A. Tjandra. A Semantics of Data Flow Diagrams. Journal article in preparation.
4. G. Butler, P.D. Grogono, R. Shinghal, and I.A. Tjandra. Knowledge and the recognition and understanding of software documents. Department of Computer Science, Concordia University, February 1995, 47 pages.
5. M.J. Chen and C.G Chung. Preventive structural analysis of dataflow diagrams. Information and Software Technology, 34(2):117–130, 1992.