Relativistic Astrophysics Legacy and Cosmology – Einstein’s - MPE/USM/MPA/ESO Joint Astronomy Conference; Aschenbach, B.; Aschenbach, Bernd; Burwitz, V.; Hasinger, G.; Leibundgut, B.; Leibundgut, Bruno; Burwitz, Vadim; Hasinger, Günther (Springer Berlin Heidelberg, 2007)