Timing of the 2008 outburst of SAX J1808.4–3658 with XMM-Newton: a stable orbital-period derivative over ten yearsL. Burderi, A. Riggio, T. Di Salvo, A. Papitto, M. T. Menna, A. D'Aì and R. IariaA&A, 496 2 (2009) L17-L20DOI: https://doi.org/10.1051/0004-6361/200811542
