Freyberg, M. J., Bräuninger, H., Burkert, W., Hartner, G. D., Citterio, O., Mazzoleni, F., et al. (2006). The MPE X-ray test facility PANTER: calibration of hard X-ray (15–50 kev) optics. Experimental Astronomy, 20(1-3), 405-412.