1. An introduction to self-organizing map is, T. Kohonen, “Self-organizing Maps”, 2nd ed. Springer-Verlag, Berlin (1997)
2. Two textbooks on neural networks are, C.M. Bishop, “Neural Networks for Pattern Recognition”, Oxford University Press, Oxford (1995)
3. B.D.Ripley, “Pattern Recognition and Neural Networks”, Cambridge University Press, Cambridge (1996)
4. Numerous resources on neural networks can be found in the on-line FAQ located at, ftp://ftp.sas.com/pub/neural/FAQ.html