Arellano Ferro, A., Bramich, D. M., Jaimes, R. F., Giridhar, S., Kains, N., Kuppuswamy, K., et al. (2013). A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry. Mon. Not. Roy. Astron. Soc., 434(2), 1220-1238. doi:10.1093/mnras/stt1080.