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John Duncan, Changes Observed in the Crab Nebula in Taurus, Proceedings of the National Academy of Sciences of the United States of America, tom 7, numer 6, strony 179-180. 15 czerwca 1921.
G. Collins, W. Claspy, J. Martin. Reinterpretation of Historical References to the Supernova of A.D. 1054. „The Publications of the Astronomical Society of the Pacific”. 111 (761), s. 871, 07/1999. DOI: 10.1086/316401. Bibcode: 1999PASP..111..871C.
R.A. Fesen, R. P. Kirshner. The Crab Nebula. I - Spectrophotometry of the filaments. „Astrophysical Journal”. 258 (1), s. 1-10, July 1, 1982. DOI: 10.1086/160043. Bibcode: 1982ApJ...258....1F.
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