Dyck, H. M.; van Belle, G. T.; Thompson, R. R. (1998-08), “Radii and Effective Temperatures for K and M Giants and Supergiants. II”, Astronomical Journal116 (2): 981-986, Bibcode: 1998AJ....116..981D, doi:10.1086/300453
Matthews, L. D.; et al. (2011-02), “H I Observations of the Asymptotic Giant Branch Star X Herculis: Discovery of an Extended Circumstellar Wake Superposed on a Compact High-velocity Cloud”, Astronomical Journal141 (2): 60, Bibcode: 2011AJ....141...60M, doi:10.1088/0004-6256/141/2/60
Jorissen, A.; et al. (2011-08), “X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed by Herschel”, Astronomy & Astrophysics532: A135, Bibcode: 2011A&A...532A.135J, doi:10.1051/0004-6361/201116927
Dyck, H. M.; van Belle, G. T.; Thompson, R. R. (1998-08), “Radii and Effective Temperatures for K and M Giants and Supergiants. II”, Astronomical Journal116 (2): 981-986, Bibcode: 1998AJ....116..981D, doi:10.1086/300453
Matthews, L. D.; et al. (2011-02), “H I Observations of the Asymptotic Giant Branch Star X Herculis: Discovery of an Extended Circumstellar Wake Superposed on a Compact High-velocity Cloud”, Astronomical Journal141 (2): 60, Bibcode: 2011AJ....141...60M, doi:10.1088/0004-6256/141/2/60
Jorissen, A.; et al. (2011-08), “X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed by Herschel”, Astronomy & Astrophysics532: A135, Bibcode: 2011A&A...532A.135J, doi:10.1051/0004-6361/201116927