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- [1] STARS WHOSE SPECTRA HAVE BRIGHT H-LINE AND K-LINE OF CALCIUM ASTROPHYSICAL JOURNAL, 1949, 109 (02): : 231 - 243
- [4] SPECTRA OF PLAGES ON THE SUN AND STARS .1. CA-II H-LINE AND K-LINE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1986, 62 (01): : 229 - 239
- [8] MEASUREMENTS OF THE K-LINE IN SPECTRA OF SUNSPOTS ASTRONOMICAL JOURNAL, 1960, 65 (02): : 55 - 55