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[8] W. A. T. Wan Abdullah, "Neural Network Logic", in O. Benhar, C. Bosio, P. del Giudice & E. Tabet
(eds.), *Neural Networks: From Biology to High Energy Physics*, ETS Editrice, Pisa, 1991, pp. 135-142. [9] W. A. T. Wan Abdullah, "Logic Programming on a Neural Network", *J. of Intelligent Systems* 7 (1992) 513-519. [10] J. J. Hopfield, "Neural networks and physical systems with emergent collective computational abilities", *Proc. Natl. Acad. Sci. USA* 79 (1982) 2554-2558.

[11] J. J. Hopfield & D. W. Tank, ""Neural" Computation of Decisions in Optimization Problems",
Biol. Cybern. 52 (1985) 141-152. [12] W. A. T. Wan Abdullah, "The Logic of Neural Networks", *Phys. Lett.* **176A** (1993) 202-206.