Rigorous dimensionality reduction through linguistically motivated feature selection for text categorization Hans Friedrich Witschel author Chris Biemann author 2006-05 text Proceedings of the 15th Nordic Conference of Computational Linguistics (NODALIDA 2005) Stefan Werner editor University of Joensuu, Finland Joensuu, Finland conference publication witschel-biemann-2006-rigorous https://aclanthology.org/W05-1729/ 2006-05 210 217