Searching for periodicities in the MACHO light curve of LMC X-2
  Using the exceptional long-term monitoring capabilities of the MACHO project, we present here the optical history of LMC X-2 for a continuous 6-yr period. These data were used to investigate the previously claimed periodicities for this source of 8.15 h and 12.54 d : we find upper amplitude limits of 0.10 mag and 0.09 mag, respectively. 
C. Alcock, R. A. Allsman, D. R. Alves, T. S. Axelrod, A. C. Becker, D.   P. Bennett, P. A. Charles, K. H. Cook, A. J. Drake,...