Alzennyr Da Silva Yves Lechevallier Fabrice Rossi Francisco de A. T. de Carvalho Clustering Dynamic Web Usage Data. 71-82 2009 Innovative Applications in Data Mining http://dx.doi.org/10.1007/978-3-540-88045-5_4 series/sci/2009-169 db/series/sci/sci169.html#SilvaLRC09