Thực đơn
NGC_6642 Tham khảoThực đơn
NGC_6642 Tham khảoLiên quan
NGC 6621 NGC 3642 NGC 6426 NGC 6626Tài liệu tham khảo
WikiPedia: NGC_6642 http://simbad.u-strasbg.fr/simbad/sim-id?Ident=NGC... //arxiv.org/abs/0903.4325 //arxiv.org/abs/1108.4402 //doi.org/10.1088%2F0004-637X%2F742%2F1%2F51 //doi.org/10.1111%2Fj.1365-2966.2009.14819.x http://www.wikisky.org/?ra=18.531730555556&de=-23.... https://ui.adsabs.harvard.edu/abs/2009MNRAS.396.15... https://ui.adsabs.harvard.edu/abs/2011ApJ...742......