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Asami Hayato; Hiroya Yamaguchi; Toru Tamagawa; Satoru Katsuda; Una Hwang; John Patrick Hughes; Midori Ozawa; Aya Bamba; Kenzo Kinugasa (2010). “Expansion Velocity of Ejecta in Tycho's Supernova Remnant Measured by Doppler Broadened X-ray Line Emission”. 《The Astrophysical Journal》 725: 894–903. arXiv:1009.6031. Bibcode:2010ApJ...725..894H. doi:10.1088/0004-637X/725/1/894.
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Williams, Brian J; Chomiuk, Laura; Hewitt, John W; Blondin, John M; Borkowski, Kazimierz J; Ghavamian, Parviz; Petre, Robert; Reynolds, Stephen P (2016년 4월 6일). “An X-ray and Radio Study of the Varying Expansion Velocities in Tycho's Supernova Remnant”. 《The Astrophysical Journal》 823 (2): L32. arXiv:1604.01779. Bibcode:2016ApJ...823L..32W. doi:10.3847/2041-8205/823/2/L32.
Asami Hayato; Hiroya Yamaguchi; Toru Tamagawa; Satoru Katsuda; Una Hwang; John Patrick Hughes; Midori Ozawa; Aya Bamba; Kenzo Kinugasa (2010). “Expansion Velocity of Ejecta in Tycho's Supernova Remnant Measured by Doppler Broadened X-ray Line Emission”. 《The Astrophysical Journal》 725: 894–903. arXiv:1009.6031. Bibcode:2010ApJ...725..894H. doi:10.1088/0004-637X/725/1/894.