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Keenan, Philip C.; McNeil, Raymond C. (1989). «The Perkins catalog of revised MK types for the cooler stars». The Astrophysical Journal Supplement Series71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
Handler, G. et al. (2009), «Asteroseismology of Hybrid Pulsators Made Possible: Simultaneous MOST Space Photometry and Ground-Based Spectroscopy of γ Peg», The Astrophysical Journal Letters698 (1): L56-L59, Bibcode:2009ApJ...698L..56H, arXiv:0905.1193, doi:10.1088/0004-637X/698/1/L56.
Keenan, Philip C.; McNeil, Raymond C. (1989). «The Perkins catalog of revised MK types for the cooler stars». The Astrophysical Journal Supplement Series71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
Handler, G. et al. (2009), «Asteroseismology of Hybrid Pulsators Made Possible: Simultaneous MOST Space Photometry and Ground-Based Spectroscopy of γ Peg», The Astrophysical Journal Letters698 (1): L56-L59, Bibcode:2009ApJ...698L..56H, arXiv:0905.1193, doi:10.1088/0004-637X/698/1/L56.
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