Conceptual Graphs for a Data Base Interface

John F. Sowa

This was the first published paper on conceptual graphs. It is available from the web site for the IBM Journal of Research and Development:

http://www.research.ibm.com/journal/rd/204/ibmrd2004E.pdf.
Original citation:
Sowa, John F. (1976) "Conceptual graphs for a data base interface", IBM Journal of Research and Development 20:4, 336-357.