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(1) The pioneer application of the CN bands as luminosity criteria was by Lindblad, B., Ap. J.55, 85, 1922.Google Scholar
(2)
(2) Weakness of CN bands in the spectra of certain stars of high velocity was first detected by Morgan, W. W., An Atlas of Stellar Spectra (1943).Google Scholar
Plate 45. Further evidence for the correlation with velocity has been given by Keenan, and Keller, , Ap. J.117, 241, 1953, Table 4.Google Scholar