Keenan, Philip C.; et al, Revised Catalog of Spectra of Mira Variables of Types ME and Se, Astrophysical Journal Supplement, 1974, 28: 271, Bibcode:1974ApJS...28..271K, doi:10.1086/190318.
Keenan, Philip C.; et al, Revised Catalog of Spectra of Mira Variables of Types ME and Se, Astrophysical Journal Supplement, 1974, 28: 271, Bibcode:1974ApJS...28..271K, doi:10.1086/190318.