An Analysis of the Relative Difficulty of Reuters-21578 Subsets Franca Debole author Fabrizio Sebastiani author 2004-05 text Proceedings of the Fourth International Conference on Language Resources and Evaluation (LREC’04) Maria Teresa Lino editor Maria Francisca Xavier editor Fátima Ferreira editor Rute Costa editor Raquel Silva editor European Language Resources Association (ELRA) Lisbon, Portugal conference publication debole-sebastiani-2004-analysis https://aclanthology.org/L04-1021/ 2004-05