Philipp Kranen Ira Assent Corinna Baldauf Thomas Seidl Self-Adaptive Anytime Stream Clustering. 249-258 2009 ICDM http://doi.ieeecomputersociety.org/10.1109/ICDM.2009.47 conf/icdm/2009 db/conf/icdm/icdm2009.html#KranenABS09