Peculiar spectral and power spectral behaviour of the LMXB GX 13+1 R. S. Schnerr, T. Reerink, M. van der Klis, J. Homan, M. Méndez, R. P. Fender and E. Kuulkers A&A, 406 1 (2003) 221-232 Published online: 17 November 2003 DOI: 10.1051/0004-6361:20030682