1. Bezdek, J.C., Pal, S.K.: Fuzzy Models for Pattern Recognition: Methods that Search for Structures in Data. IEEE, New York (1992)
2. Ciesielski, K., Draminski, M., Klopotek, M., Kujawiak, M., Wierzchon, S.: Mapping document collections in non-standard geometries. In: De Beats, B., De Caluwe, R., de Tre, G., Fodor, J., Kacprzyk, J., Zadrony, S. (eds.) Current Issues in Data and Knowledge Engineering, pp. 122–132. Akademicka Oficyna Wydawnicza EXIT Publishing, Warszawa (2004)
3. Lecture Notes in Computer Science;K. Ciesielski,2006
4. Dittenbach, M., Rauber, A., Merkl, D.: Uncovering hierarchical structure in data using the Growing Hierarchical Self-Organizing Map. Neurocomputing 48(1-4), 199–216 (2002)
5. Dorigo, M., Di Caro, G.: The Ant Colony Optimization Meta-Heuristic. In: Corne, D., Dorigo, M., Glover, F. (eds.) New Ideas in Optimization, pp. 11–32. McGraw-Hill, New York (1999)