Haserer, Wolfgang (January 18, 2011). "Musikalisch unumstritten" (in German). OVB Online. Archived from the original on March 25, 2012. Retrieved June 13, 2011.
Haserer, Wolfgang (January 18, 2011). "Musikalisch unumstritten" (in German). OVB Online. Archived from the original on March 25, 2012. Retrieved June 13, 2011.