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WikiPedia: Cygnus_OB2 http://www.tim-thompson.com/cyg-ob2-12.html http://adsabs.harvard.edu/abs/2012A&A...539A..79R http://www.arxiv.org/abs/1406.6655v1 //doi.org/10.1051%2F0004-6361%2F201118211 //doi.org/10.1093%2Fmnras%2Fstt2232 //dx.doi.org/10.1051%2F0004-6361%2F201117472 //dx.doi.org/10.1051%2F0004-6361%2F201219442 //dx.doi.org/10.1051%2F0004-6361:20021432 //dx.doi.org/10.1086%2F115774 //dx.doi.org/10.1086%2F307185