hal-00460307v1Communication dans un congrès Martine Cadot, Alain Lelu. Optimized Representation for Classifying Qualitative Data Fritz Laux, Lena Strömbäck. Second International Conference on Advances in Databases, Knowledge, and Data Applications - DBKDA 2010, Apr 2010, Menuires, The Three Valleys, France. IEEE Computer Society, Conference Publishing Service, pp.241-246, 2010