Marcus Gallagher Tom Downs Visualization of learning in multilayer perceptron networks using principal component analysis. 28-34 2003 33 IEEE Transactions on Systems, Man, and Cybernetics, Part B 1 db/journals/tsmc/tsmcb33.html#GallagherD03 http://dx.doi.org/10.1109/TSMCB.2003.808183