Kuster, M. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Kretschmar, P. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Kreykenbohm, I., Wilms, J., Coburn, W., Kuster, M., Rothschild, R. E., Heindl, W. A., et al. (2004). The variable cyclotron line in GX 301-2. Astronomy & Astrophysics, 427(3), 975-986. doi:10.1051/0004-6361:20035836.