Optimal Capacity of the Blume-Emery-Griffiths perceptron
  A Blume-Emery-Griffiths perceptron model is introduced and its optimal capacity is calculated within the replica-symmetric Gardner approach, as a function of the pattern activity and the imbedding stability parameter. The stability of the replica-symmetric approximation is studied via the analogue of the Almeida-Thouless line. A comparison is made with other three-state perceptrons. 
D.Bolle, I. Perez Castillo, G. M. Shim