- ... Corpora
- The term 'hardness' is employed like in [1] where this term was introduced to analyse the relative hardness of the Reuters corpora
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- ... Reuters-21578
- http://www.daviddlewis.com/resources/testcollections/reuters21578/
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- ... Newsgroups
- http://people.csail.mit.edu/jrennie/20Newsgroups/
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