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Discoveries on Southern Objective-Prism Plates I. New Helium-Rich Stars
Publications of the Astronomical Society of the Pacific, 1970W P Bidelman
exaly
A Quantitative NLTE Analysis of Visual and Ultraviolet Spectra of Four Helium-Rich Subdwarf O Stars
Astronomy and Astrophysics, 2018Ulrich Heber +2 more
exaly

