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Fesen, Robert A.; Hammell, Molly C.; Morse, Jon; Chevalier, Roger A.; Borkowski, Kazimierz J.; Dopita, Michael A.; Gerardy, Christopher L.; Lawrence, Stephen S. et al. (2006). «The Expansion Asymmetry and Age of the Cassiopeia A Supernova Remnant». The Astrophysical Journal645 (1): 283-292. Bibcode:2006ApJ...645..283F. arXiv:astro-ph/0603371. doi:10.1086/504254.Se sugiere usar |número-autores= (ayuda)
Pavlov GG, Zavlin VE, Aschenbach B, Trumper J, Sanwal D (2000). «The Compact Central Object in Cassiopeia A: A Neutron Star with Hot Polar Caps or a Black Hole?». The Astrophysical Journal531 (1): L53-L56. PMID10673413. doi:10.1086/312521.