Haberl, F. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Motch, C., Lopes de Oliveira, R., Negueruela, I., Haberl, F., & Janot-Pacheco, E. (2007). X-ray and optical properties of new γ Cas-like objects discovered in X-ray surveys. In S. Stefl, S. Owocki, & A. Okazaki (Eds.), Active OB-Stars: Laboratories for Stellar and Circumstellar Physics (pp. 117-123). San Francisco, CA, USA: Astronomical Society of the Pacific.