Monitoring campaign of 1RXS J171824.2–402934, the low-mass X-ray binary with the lowest mass accretion rateJ. J. M. in 't Zand, P. G. Jonker, C. G. Bassa, C. B. Markwardt and A. M. LevineA&A, 506 2 (2009) 857-863DOI: https://doi.org/10.1051/0004-6361/200912403