Kuulkers, E., van der Klis, M., Oosterbroek, T., Asai, K., Dotani, T., van Paradijs, J. A., & Lewin, W. H. G. (1994). Spectral and correlated timing behaviour of GX 5-1. Astronomy & Astrophysics, 289, 795-821.
Kuulkers, E., & van der Klis, M. (1993). G 5-1, or: how to become a z source. In O. Regev, & G. Shaviv (Eds.), Cataclysmic variables and related physics: 2nd Technion Haifa Conference (pp. 296). (Annals of the Israel Physical Society). Institute of Physics Publishing.
