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Advances in Pattern Recognition - ICAPR 2001. Proceedings, Heidelberg, Springer, pp. 425-434, March, 2001.
Somol, P., P. Pudil, F. J. Ferri, and J. Kittler,
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Proceedings of SCI 2000. The 4th World Multiconference on Systemics, Cybernetics and Informatics, Orlando, IIIS, pp. 646-651, July, 2000.