1. R. J. Baron. Mechanisms of human facial recognition. International Journal of Man-Machine Studies ,15:137–178, 1981.
2. P. J. Benson and D. L Perrett. Perception and recognition of photographic quality facial caricatures: Implications for the recognition of natural images. European Journal of Cognitive Psychology ,3(1):105–135, 1991.
3. V. Bruce, A. M. Burton, and I. Craw. Modelling face recognition. Philosophical Transactions of the Royal Society of London, Series B ,335:121–128, 1992.
4. R. Brunelli and T. Poggio. HyberBF networks for gender classification. Preprint, 1991.
5. G. W. Cottrell and M. Fleming. Face recognition using unsupervised feature extraction. In Proceedings of the International Neural Net Confernce ,pages 322–325. Dordrecht Kluwer, 1990.