Low-density laboratory spectra near the He ii ?304 lineDOI: info:10.1051/0004-6361/201527825v. 586EDP SciencesA115
Träbert, Elmar, Beiersdorfer, Peter, Brickhouse, Nancy S., and Golub, Leon. 2016. "Low-density laboratory spectra near the He ii ?304 line." Astronomy and Astrophysics, 586 A115. https://doi.org/10.1051/0004-6361/201527825.