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- [23] The spectral and temporal properties of an ultraluminous X-ray source in NGC 6946 ASTROPHYSICAL JOURNAL, 2008, 682 (01): : 218 - 222
- [24] A radio nebula surrounding the ultraluminous X-ray source in NGC 5408 ASTROPHYSICAL JOURNAL, 2007, 666 (01): : 79 - 85
- [29] VLT observations of the ultraluminous X-ray source NGC 1313 X-2 ASTROPHYSICAL JOURNAL, 2005, 633 (02): : L101 - L104