1. Approximation bounds for superpositions of a sigmoidal function;Barron,1991
2. Universal approximation bounds for superpositions of a sigmoidal function;Barron,1991
3. Approximation by superpositions of a sigmoidal function;Cybenko;Mathematics of Control, Signals and Systems,1989
4. Theory of the Backpropagation Neural Network;Hecht-Nielsen,1989
5. Multi-layer feedforward networks are universal approximators;Hornik;Neural Networks,1989