Freyberg, M. J. High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society;
Kirsch, M. G. F., Breitfellner, M., Djavidnia, S., Freyberg, M. J., Kendziorra, E., Mukerjee, K., et al. (2004). XTE J1807-294: Modulation of the pulsar flux with a refined spin period and orbit parameters.