The Onion-like Metallicity Structure of Tycho's Supernova Remnant as Revealed by Doppler Broadened X-ray Emission Lines
Proceedings article published in 2010 by
Asami Hayato,
Toru Tamagawa,
Hiroya Yamaguchi,
Akihiro Furuzawa,
Midori Ozawa,
Hideyo Kunieda,
John P. Hughes 
,
Una Hwang,
Aya Bamba,
Kazuo Makishima
,
Una Hwang,
Aya Bamba,
Kazuo Makishima
