1. Angelova, G., K. Bontcheva. DB-MAT: Knowledge Acquisition, Processing and NL Generation using conceptual graphs. Proc. ICCS-96, LNAI 1115, pp. 115–129. See also http://www.lml.bas.bg/projects/dbr-mat/
2. Galia Angelova, Kristina Toutanova, Svetlana Damianova Knowledge Base of Conceptual Graphs for Generation of Natural Language Explanations in Knowledge Based Machine Aided Translation Project DBR-MAT “Intelligent Translation System”, Technical Report BG-3-1998, September 1998
3. Angelova, G., Damianova, Sv., Toutanova, K., Bontcheva, K. Menu-Based Interface to Conceptual Graphs: The CGLex Approach In Proc. ICCS-97, LNAI 1257, pp. 603–606. CGLex-funded by The Bulgarian National Science Fund under contract I-420/94. See also http://www.lml.bas.bg/projects/cglex/
4. Gaines, Brian R.: A Situated Classification Solution of a Resource Allocation Task Represented in a Visual Language. See: http://ksi.cpsc.ucalgary.ca/KAW/Sisyphus/Sis1/
5. Delugach, Harry S.: Dynamic Assertion and Retraction of Conceptual Graphs. In: Proc. of the 6th Ann. Workshop on Conceptual Structures, 1991, E. Way (Ed.), Binghamton, N.Y.: SUNY at Binghamton, pp. 15–24.