From Newton to Einstein N-body dynamics in galactic nuclei and SPH using new special hardware and astrogrid-D - Spurzem, Rainer; Berczik, Peter; Berentzen, Ingo; Brüsemeister, Thomas; Schwekendiek, Peter; Steinacker, Jürgen; Wambsganß, Joachim (Journal of physics. Conference Series, 2007)