Boller, Th. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Wandel, A., & Boller, T. (1997). X-ray variability and spectral scaling: a measure of BLR sizes in AGN. In D. Maoz, A. Sternberg, & E. M. Leibowitz (Eds.), Astronomical Time Series: Proceedings of The Florence and George Wise Observatory 25th Anniversary Symposium (pp. 255-258). Dordrecht [u.a.]: Kluwer Academic Publishers.