Ana Paula Appel Adriano Arantes Paterlini Elaine P. M. de Sousa Agma J. M. Traina Caetano Traina Jr. A Density-Biased Sampling Technique to Improve Cluster Representativeness. 366-373 2007 conf/pkdd/2007 PKDD http://dx.doi.org/10.1007/978-3-540-74976-9_35 db/conf/pkdd/pkdd2007.html#AppelPSTT07