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Usenko, I. A.; et al. (November 2015), "Spectroscopic studies of four southern-hemisphere G-K supergiants: HD 192876 (α1 Cap), HD 194215 (HR 7801), HD 206834 (c Cap), and HD 222574 (104 Aqr)", Astronomy Letters, 41 (11): 660–676, Bibcode:2015AstL...41..660U, doi:10.1134/S1063773715110067, S2CID124555577.