Publications
2011. From slacktivism to activism: participatory culture in the age of social media. Proceedings of the 2011 annual conference extended abstracts on Human factors in computing systems. :819-822.
2012. Dynamic changes in motivation in collaborative citizen-science projects. Proceedings of the ACM 2012 conference on Computer Supported Cooperative Work. :217-226.
1989. Lessons learned from the ACM hypertext on hypertext project. Proceedings of the second annual ACM conference on Hypertext. :385-386.
1984. A framework for self-describing and self-documenting database systems. NBS Trends and Application Conference.
2006. Dwarf cube architecture for reducing storage sizes of multidimensional data. 10/157,960(7133876)
1973. A max {m, n} algorithm for determining the graph H from its line graph G. Information Processing Letters. 2(4):108-112.
1985. Schema manipulation in self-describing and self-documenting data models. International Journal of Parallel Programming. 14(1):1-28.
1982. The Logical Access Path Schema of a Database. IEEE Transactions on Software Engineering. SE-8(6):563-573.
2003. The Opsis project: materialized views for data warehouses and the web. Advances in Informatics. :64-81.
1985. SEES—A Software testing Environment Support System. IEEE Transactions on Software Engineering. SE-11(4):355-366.
1984. An introduction to PSQL: A pictorial structured query language. Proc. IEEE Workshop on Visual Languages. :77-87.
1985. Direct spatial search on pictorial databases using packed R-trees. ACM SIGMOD Record. 14:17-31.
1993. ADMS: a testbed for incremental access methods. IEEE Transactions on Knowledge and Data Engineering. 5(5):762-774.
1984. GDDT--A graphical design and documentation tool for software development. Computers & Graphics. 8(3):309-323.
1988. An efficient pictorial database system for PSQL. IEEE Transactions on Software Engineering. 14(5):639-650.
1991. A pipeline N-way join algorithm based on the 2-way semijoin program. IEEE Transactions on Knowledge and Data Engineering. 3(4):486-495.
2009. Conceptual modeling: past, present and the continuum of the future. Conceptual Modeling: Foundations and Applications. :139-152.
1975. Using semantic networks for data base management. Proceedings of the 1st International Conference on Very Large Data Bases. :144-172.
1986. Principles and techniques in the design of ADMS+((advanced data-base management system)). Computer. 19:19-23.