Algorithms for Principal Components Analysis

[Fernando Corte Real]

Just a short correction to Sanger's bibliographic list on
compettitive Hebbian and related algorithms: 
The last work listed there was already published a few months ago. 
A shorter version can be found in

[1] F.M. Silva, L. B. Almeida, "A Distributed Solution for Data 
Orthonormalization", in Proc. ICANN, Helsinki, 1991.

The following reference may also be added to Sanger's list:

[2] R. Williams, "Feature Discovery Trough Error-Correction Learning",
ICS Report 8501, University of California, San Diego, 1985

Since there has been so much discussion in the net about 2nd. order
algorithms, an aplication of [1] to the improvement  of the so-called 
"diagonal" 2nd. order algorithms can be found in the following reference:

[3] F.M. Silva, L. B. Almeida, "Speeding-Up Backpropagation by Data
Orthonormalization", in Proc. ICANN, Helsinki, 1991.