Progressive Query Optimization for Federated Queries. - Stephan Ewen; Holger Kache; Volker Markl; Vijayshankar Raman (EDBT, 2006)

POP/FED: Progressive Query Optimization for Federated Queries in DB2. - Holger Kache; Wook-Shin Han; Volker Markl; Vijayshankar Raman; Stephan Ewen (VLDB, 2006)

Progressive optimization in a shared-nothing parallel database. - Wook-Shin Han; Jack Ng; Volker Markl; Holger Kache; Mokhtar Kandil (SIGMOD Conference, 2007)

Transformation Rule Discovery through Data Mining. - Holger Kache; Yannick Saillet; Mary Roth (NTII, 2008)