Line ratios for helium-like ions: Applications to collision-dominated plasmas
A&A, 376 3 (2001) 1113-1122
Published online: 2001-09-15
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https://doi.org/10.1051/0004-6361:20020445
New Challenges for Wind Shock Models: TheChandraSpectrum of the Hot Star δ Orionis
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https://doi.org/10.1086/342111