References

Graf et al., 1987

Graf, H., Hubbard, W., Jackel, L., and deVegvar P.G.N (1987). A cmos associative memory chip. In 1st Int. Conference Neural Nets, San Diego.
(I have this).

Hebb, 1949

Hebb, D. (1949). The Organization of behaviour. John Wiley.

Hopfield, 1982

Hopfield, J. (1982). Neural networks and physical systems with emergent collective computational properties. Proceedings of the National Academy of Sciences of the USA, 79:2554 - 2588. Hopfield has another, related, model which uses continuous outputs. Beware when reading the literature which model is being discussed.

Hopfield, 1984

Hopfield, J. (1984). Neurons with graded response have collective computational properties like those of two-state neurons. Proceedings of the National Academy of Sciences of the USA, 81:3088 - 3092.

Hopfield and Tank, 1985

Hopfield, J. and Tank, D. (1985). Neural computation of decisions in optimization problems. Biological Cybernetics, 52:141 - 152.

McEliece et al., 1987

McEliece, R., Posner, E., Rodemich, E., and Venkatesh, S. (1987). The capacity of the hopfield associative memory. IEEE Transactions on Information Theory, IT-33:461 - 482.
There are many papers on this area, but this has some non- technical material near the beginning before getting into the welter of maths needed for this kind of analysis.