1. Ali, F. and Pavlidis, T. (1977) Syntactic recognition of handwritten numerals. IEEE Trans. Syst., Man Cybern. 7, 537–41.
2. Anderberg, M.R. (1973) Cluster Analysis for Applications, Academic Press, London.
3. Anderson, T.W., Gupta, S.D. and Styan, G.P.H. (1972) A Bibliography of Multivariate Statistical Analysis. Oliver and Boyd, Edinburgh.
4. Andrews, H.C. (1972) Introduction to Mathematical Techniques in Pattern Recognition. John Wiley & Sons, Inc.
5. Ardema, M.D. (1983) Singular Perturbations in Systems and Control, Springer Verlaag, New York.