1. Neurons with graded response have collective computational properties like those of two-state neurons;Hopfield,1984
2. Single effective neuron;Schieve;Phys. Rev. A,1991
3. Synergetics;Haken,1977
4. Advanced Synergetics;Haken,1993
5. Chaos in an effective four-neuron neural netwok;Das;Phys. Lett. A,1991