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J. Nordhaus, I. Minchev, B. Sargent, W. Forrest, E. G. Blackman, O. De Marco, J. Kastner, B. Balick et A. Frank, « Towards a spectral technique for determining material geometry around evolved stars: Application to HD 179821 », Monthly Notices of the Royal Astronomical Society, (DOI10.1111/j.1365-2966.2008.13428.x, Bibcode2008MNRAS.388..716N, arXiv0801.2978, S2CID17468700)
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Bruce J. Hrivnak, Sun Kwok et Kevin M. Volk, « A study of several F and G supergiant-like stars with infrared excesses as candidates for proto-planetary nebulae », Astrophysical Journal, (DOI10.1086/168007, Bibcode1989ApJ...346..265H)
J. Nordhaus, I. Minchev, B. Sargent, W. Forrest, E. G. Blackman, O. De Marco, J. Kastner, B. Balick et A. Frank, « Towards a spectral technique for determining material geometry around evolved stars: application to HD 179821 », Monthly Notices of the Royal Astronomical Society, , p. 0801.2978 (DOI10.1111/j.1365-2966.2008.13428.x, Bibcode2008MNRAS.388..716N, S2CID17468700)
V. P. Arkhipova, N. P. Ikonnikova, R. I. Noskova, G. V. Sokol et S. Yu. Shugarov, « Light variations in the candidate for protoplanetary objects HD 179821=V1427 Aql in 1899–1999 », Astronomy Letters, , p. 156–162 (DOI10.1134/1.1351559, Bibcode2001AstL...27..156A, S2CID119759129)
D. Teyssier, G. Quintana-Lacaci, A. P. Marston, V. Bujarrabal, J. Alcolea, J. Cernicharo, L. Decin, C. Dominik, K. Justtanont, A. De Koter, G. Melnick, K. M. Menten, D. A. Neufeld, H. Olofsson, P. Planesas, M. Schmidt, R. Soria-Ruiz, F. L. Schöier, R. Szczerba et L. B. F. M. Waters, « Herschel/HIFI observations of red supergiants and yellow hypergiants. I. Molecular inventory », Astronomy and Astrophysics, (DOI10.1051/0004-6361/201219545, Bibcode2012A&A...545A..99T, arXiv1208.3143, S2CID6602462)
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E. Høg, C. Fabricius, V. V. Makarov, S. Urban, T. Corbin, G. Wycoff, U. Bastian, P. Schwekendiek et A. Wicenec, « The Tycho-2 catalogue of the 2.5 million brightest stars », Astronomy and Astrophysics, (ISBN0333750888, DOI10.1888/0333750888/2862, Bibcode2000A&A...355L..27H)
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Philip C. Keenan et Raymond C. McNeil, « The Perkins catalog of revised MK types for the cooler stars », Astrophysical Journal Supplement Series, (DOI10.1086/191373, Bibcode1989ApJS...71..245K)
J. Nordhaus, I. Minchev, B. Sargent, W. Forrest, E. G. Blackman, O. De Marco, J. Kastner, B. Balick et A. Frank, « Towards a spectral technique for determining material geometry around evolved stars: Application to HD 179821 », Monthly Notices of the Royal Astronomical Society, (DOI10.1111/j.1365-2966.2008.13428.x, Bibcode2008MNRAS.388..716N, arXiv0801.2978, S2CID17468700)
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J. Nordhaus, I. Minchev, B. Sargent, W. Forrest, E. G. Blackman, O. De Marco, J. Kastner, B. Balick et A. Frank, « Towards a spectral technique for determining material geometry around evolved stars: application to HD 179821 », Monthly Notices of the Royal Astronomical Society, , p. 0801.2978 (DOI10.1111/j.1365-2966.2008.13428.x, Bibcode2008MNRAS.388..716N, S2CID17468700)
V. P. Arkhipova, N. P. Ikonnikova, R. I. Noskova, G. V. Sokol et S. Yu. Shugarov, « Light variations in the candidate for protoplanetary objects HD 179821=V1427 Aql in 1899–1999 », Astronomy Letters, , p. 156–162 (DOI10.1134/1.1351559, Bibcode2001AstL...27..156A, S2CID119759129)
D. Teyssier, G. Quintana-Lacaci, A. P. Marston, V. Bujarrabal, J. Alcolea, J. Cernicharo, L. Decin, C. Dominik, K. Justtanont, A. De Koter, G. Melnick, K. M. Menten, D. A. Neufeld, H. Olofsson, P. Planesas, M. Schmidt, R. Soria-Ruiz, F. L. Schöier, R. Szczerba et L. B. F. M. Waters, « Herschel/HIFI observations of red supergiants and yellow hypergiants. I. Molecular inventory », Astronomy and Astrophysics, (DOI10.1051/0004-6361/201219545, Bibcode2012A&A...545A..99T, arXiv1208.3143, S2CID6602462)
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J. Nordhaus, I. Minchev, B. Sargent, W. Forrest, E. G. Blackman, O. De Marco, J. Kastner, B. Balick et A. Frank, « Towards a spectral technique for determining material geometry around evolved stars: Application to HD 179821 », Monthly Notices of the Royal Astronomical Society, (DOI10.1111/j.1365-2966.2008.13428.x, Bibcode2008MNRAS.388..716N, arXiv0801.2978, S2CID17468700)
J. Nordhaus, I. Minchev, B. Sargent, W. Forrest, E. G. Blackman, O. De Marco, J. Kastner, B. Balick et A. Frank, « Towards a spectral technique for determining material geometry around evolved stars: application to HD 179821 », Monthly Notices of the Royal Astronomical Society, , p. 0801.2978 (DOI10.1111/j.1365-2966.2008.13428.x, Bibcode2008MNRAS.388..716N, S2CID17468700)
V. P. Arkhipova, N. P. Ikonnikova, R. I. Noskova, G. V. Sokol et S. Yu. Shugarov, « Light variations in the candidate for protoplanetary objects HD 179821=V1427 Aql in 1899–1999 », Astronomy Letters, , p. 156–162 (DOI10.1134/1.1351559, Bibcode2001AstL...27..156A, S2CID119759129)
D. Teyssier, G. Quintana-Lacaci, A. P. Marston, V. Bujarrabal, J. Alcolea, J. Cernicharo, L. Decin, C. Dominik, K. Justtanont, A. De Koter, G. Melnick, K. M. Menten, D. A. Neufeld, H. Olofsson, P. Planesas, M. Schmidt, R. Soria-Ruiz, F. L. Schöier, R. Szczerba et L. B. F. M. Waters, « Herschel/HIFI observations of red supergiants and yellow hypergiants. I. Molecular inventory », Astronomy and Astrophysics, (DOI10.1051/0004-6361/201219545, Bibcode2012A&A...545A..99T, arXiv1208.3143, S2CID6602462)