Formiggini, Liliana; Brosch, Noah; Almoznino, Elchanan; Bowyer, Stuart; Lampton, Michael (May 2002), ”Hidden subluminous stars among the FAUST UV sources towards Ophiuchus”, Monthly Notices of the Royal Astronomical Society 332 (2): 441–455, doi:10.1046/j.1365-8711.2002.05327.x, Bibcode: 2002MNRAS.332..441F.
Boyles, J.; Lorimer, D. R.; Turk, P. J.; Mnatsakanov, R.; Lynch, R. S.; Ransom, S. M.; Freire, P. C.; Belczynski, K. (November 2011), ”Young Radio Pulsars in Galactic Globular Clusters”, The Astrophysical Journal 742 (1): 51, doi:10.1088/0004-637X/742/1/51, Bibcode: 2011ApJ...742...51B.
Arellano Ferro, A.; Bramich, D. M.; Figuera Jaimes, R.; Giridhar, Sunetra; Kains, N.; Kuppuswamy, K.; Jørgensen, U. G.; Alsubai, K. A.; et al. (September 2013), ”A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry”, Monthly Notices of the Royal Astronomical Society 434 (2): 1220–1238, doi:10.1093/mnras/stt1080, Bibcode: 2013MNRAS.434.1220A.
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Formiggini, Liliana; Brosch, Noah; Almoznino, Elchanan; Bowyer, Stuart; Lampton, Michael (May 2002), ”Hidden subluminous stars among the FAUST UV sources towards Ophiuchus”, Monthly Notices of the Royal Astronomical Society 332 (2): 441–455, doi:10.1046/j.1365-8711.2002.05327.x, Bibcode: 2002MNRAS.332..441F.
Boyles, J.; Lorimer, D. R.; Turk, P. J.; Mnatsakanov, R.; Lynch, R. S.; Ransom, S. M.; Freire, P. C.; Belczynski, K. (November 2011), ”Young Radio Pulsars in Galactic Globular Clusters”, The Astrophysical Journal 742 (1): 51, doi:10.1088/0004-637X/742/1/51, Bibcode: 2011ApJ...742...51B.
Shapley, Harlow; Sawyer, Helen B. (August 1927), ”A Classification of Globular Clusters”, Harvard College Observatory Bulletin 849 (849): 11–14, Bibcode: 1927BHarO.849...11S.
Arellano Ferro, A.; Bramich, D. M.; Figuera Jaimes, R.; Giridhar, Sunetra; Kains, N.; Kuppuswamy, K.; Jørgensen, U. G.; Alsubai, K. A.; et al. (September 2013), ”A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry”, Monthly Notices of the Royal Astronomical Society 434 (2): 1220–1238, doi:10.1093/mnras/stt1080, Bibcode: 2013MNRAS.434.1220A.