↑ 2,02,1Piskunov, A. E.; Schilbach, E.; Kharchenko, N. V.; Röser, S. και άλλοι. (January 2008). «Tidal radii and masses of open clusters». Astronomy and Astrophysics477 (1): 165–172. doi:10.1051/0004-6361:20078525. Bibcode: 2008A&A...477..165P. See online data.
↑Dias W.S., Alessi B.S., Moitinho A., Lepine J.R.D. (July 2002). «New catalog of optically visible open clusters and candidates». Astronomy and Astrophysics389 (3): 871–873. doi:10.1051/0004-6361:20020668. Bibcode: 2002A&A...389..871D. Note: see the VizieR catalogue B/ocl.