International Conference on Intelligent Systems and Semiotics Gaithersburg, Md., National Institute of Standards and Technology (U.S.), & Meystel, A. (1997). Proceedings of the 1997 International Conference on Intelligent Systems and Semiotics: A learning perspective, ISAS '97, Gaithersburg, MD, September 22-25, 1997. The Institute ; For sale by the Supt. of Docs., U.S. G.P.O..

International Conference on Intelligent Systems and Semiotics Gaithersburg, Md., National Institute of Standards and Technology (U.S.), and A. Meystel. Proceedings of the 1997 International Conference on Intelligent Systems and Semiotics: A Learning Perspective, ISAS '97, Gaithersburg, MD, September 22-25, 1997. Gaithersburg, Md. : Washington, DC: The Institute ; For sale by the Supt. of Docs., U.S. G.P.O., 1997.

International Conference on Intelligent Systems and Semiotics Gaithersburg, Md., et al. Proceedings of the 1997 International Conference on Intelligent Systems and Semiotics: A Learning Perspective, ISAS '97, Gaithersburg, MD, September 22-25, 1997. The Institute ; For sale by the Supt. of Docs., U.S. G.P.O., 1997.