Heinz, S; Burton, M; Braiding, C; Brandt, W. N; Jonker, P. G; Sell, P; Fender, R. P; Nowak, M. A; Schulz, N. S. Lord of the Rings: A Kinematic Distance to Circinus X-1 from a Giant X-Ray Light Echo Lord of the Rings: A Kinematic Distance to Circinus X-1 from a Giant X-Ray Light Echo (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2015. — Vol. 806, no. 2. — P. 265. — doi:10.1088/0004-637X/806/2/265. — Bibcode: 2015ApJ...806..265H. — arXiv:1506.06142.
Heinz, S; Burton, M; Braiding, C; Brandt, W. N; Jonker, P. G; Sell, P; Fender, R. P; Nowak, M. A; Schulz, N. S. Lord of the Rings: A Kinematic Distance to Circinus X-1 from a Giant X-Ray Light Echo Lord of the Rings: A Kinematic Distance to Circinus X-1 from a Giant X-Ray Light Echo (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2015. — Vol. 806, no. 2. — P. 265. — doi:10.1088/0004-637X/806/2/265. — Bibcode: 2015ApJ...806..265H. — arXiv:1506.06142.
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Heinz, S; Burton, M; Braiding, C; Brandt, W. N; Jonker, P. G; Sell, P; Fender, R. P; Nowak, M. A; Schulz, N. S. Lord of the Rings: A Kinematic Distance to Circinus X-1 from a Giant X-Ray Light Echo Lord of the Rings: A Kinematic Distance to Circinus X-1 from a Giant X-Ray Light Echo (англ.) // The Astrophysical Journal : journal. — IOP Publishing, 2015. — Vol. 806, no. 2. — P. 265. — doi:10.1088/0004-637X/806/2/265. — Bibcode: 2015ApJ...806..265H. — arXiv:1506.06142.
Margon B; Lampton M; Bowyer S; Cruddace R. A Pulsing X-Ray Source in Circinus // Astrophys. J.. — 1971. — Октябрь (т. 169, № 10). — С. L23—5. — doi:10.1086/180806. — Bibcode: 1971ApJ...169L..23M.