Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn (2016-04-13). “Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star”. The Astrophysical Journal (American Astronomical Society) 821 (2): 81. arXiv:1602.01912. Bibcode: 2016ApJ...821...81G. doi:10.3847/0004-637x/821/2/81. ISSN1538-4357.
Anglada-Escudé, G. et al. (2014-07-08). “Two planets around Kapteyn's star: a cold and a temperate super-Earth orbiting the nearest halo red dwarf”. Monthly Notices of the Royal Astronomical Society: Letters (Oxford University Press (OUP)) 443 (1): L89-L93. arXiv:1406.0818. Bibcode: 2014MNRAS.443L..89A. doi:10.1093/mnrasl/slu076. ISSN1745-3933.
Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn (2016-04-13). “Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star”. The Astrophysical Journal (American Astronomical Society) 821 (2): 81. arXiv:1602.01912. Bibcode: 2016ApJ...821...81G. doi:10.3847/0004-637x/821/2/81. ISSN1538-4357.
Anglada-Escudé, G. et al. (2014-07-08). “Two planets around Kapteyn's star: a cold and a temperate super-Earth orbiting the nearest halo red dwarf”. Monthly Notices of the Royal Astronomical Society: Letters (Oxford University Press (OUP)) 443 (1): L89-L93. arXiv:1406.0818. Bibcode: 2014MNRAS.443L..89A. doi:10.1093/mnrasl/slu076. ISSN1745-3933.
Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn (2016-04-13). “Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star”. The Astrophysical Journal (American Astronomical Society) 821 (2): 81. arXiv:1602.01912. Bibcode: 2016ApJ...821...81G. doi:10.3847/0004-637x/821/2/81. ISSN1538-4357.
Anglada-Escudé, G. et al. (2014-07-08). “Two planets around Kapteyn's star: a cold and a temperate super-Earth orbiting the nearest halo red dwarf”. Monthly Notices of the Royal Astronomical Society: Letters (Oxford University Press (OUP)) 443 (1): L89-L93. arXiv:1406.0818. Bibcode: 2014MNRAS.443L..89A. doi:10.1093/mnrasl/slu076. ISSN1745-3933.
Guinan, Edward F.; Engle, Scott G.; Durbin, Allyn (2016-04-13). “Living with a Red Dwarf: Rotation and X-Ray and Ultraviolet Properties of the Halo Population Kapteyn's Star”. The Astrophysical Journal (American Astronomical Society) 821 (2): 81. arXiv:1602.01912. Bibcode: 2016ApJ...821...81G. doi:10.3847/0004-637x/821/2/81. ISSN1538-4357.
Anglada-Escudé, G. et al. (2014-07-08). “Two planets around Kapteyn's star: a cold and a temperate super-Earth orbiting the nearest halo red dwarf”. Monthly Notices of the Royal Astronomical Society: Letters (Oxford University Press (OUP)) 443 (1): L89-L93. arXiv:1406.0818. Bibcode: 2014MNRAS.443L..89A. doi:10.1093/mnrasl/slu076. ISSN1745-3933.