Benzon, W., Hays, D., Darden, L., Young, D., Firschein, O., Kasday, L., Engelmore, R., Minsky, M. L., Patel-Schneider, P., Mazzetti, C., Feigenbaum, E. A., Nii, H. P. and Zadeh, L. A. (1987) “Letters to the Editor”, AI Magazine, 8(4), p. 7. doi: 10.1609/aimag.v8i4.620.