Temperature Classification of the Spectra of Europium, Gadolinium, Terbium, Dysprosium, and Holmium, λ 3850 TO λ 4700
- 1 November 1930
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 72, 221
- https://doi.org/10.1086/143278