@incollection {Arco2008:RSTTextMining,
   author = {Leticia Arco and Rafael Bello and Yailé Caballero and Rafael Falcon},
   title = {{Rough Text Assisting Text Mining: Focus on Document Clustering Validity}},
   booktitle = {Granular Computing: at the Junction of Rough Sets and Fuzzy Sets},
   series = {Studies in Fuzziness and Soft Computing},
   editor = {Rafael Bello and Rafael Falcon and Witold Pedrycz and Janusz Kacprzyk},
   publisher = {Springer Berlin / Heidelberg},
   pages = {229-248},
   volume = {224},
   url = {http://dx.doi.org/10.1007/978-3-540-76973-6_15},
   note = {10.1007/978-3-540-76973-6_15},
   year = {2008}
}