1. Achtert, E., Kriegel, H. P., Pryakhin, A., & Schubert, M. (2005). Hierarchical density-based clustering for multi-represented objects. In Workshop on mining complex data (MCD) on the 5th IEEE international conference on data mining (ICDM), Houston, TX (p. 9).
2. Achtert, E., Böhm, C., Kriegel, H. P., Kröger, P., Müller-Gorman, I., & Zimek, A. (2006a). Finding hierarchies of subspace clusters. In Proceedings of the 10th European conference on principles and practice of knowledge discovery in databases (PKDD), Berlin, Germany (pp. 446–453). doi: 10.1007/11871637_42 .
3. Achtert, E., Böhm, C., Kröger, P., & Zimek, A. (2006b). Mining hierarchies of correlation clusters. In Proceedings of the 18th international conference on scientific and statistical database management (SSDBM), Vienna, Austria (pp. 119–128). doi: 10.1109/SSDBM.2006.35 .
4. Achtert, E., Kriegel, H. P., Pryakhin, A., & Schubert, M. (2006c). Clustering multi-represented objects using combination trees. In Proceedings of the 10th Pacific-Asia conference on knowledge discovery and data mining (PAKDD), Singapore (pp. 174–178). doi: 10.1007/11731139_21 .
5. Achtert, E., Böhm, C., Kriegel, H. P., Kröger, P., Müller-Gorman, I., & Zimek, A. (2007a). Detection and visualization of subspace cluster hierarchies. In Proceedings of the 12th international conference on database systems for advanced applications (DASFAA), Bangkok, Thailand (pp. 152–163). doi: 10.1007/978-3-540-71703-4_15 .