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Fabrycky; Murray-Clay; et al. (1 de dezembro de 2008). «Stability of the directly imaged multiplanet system HR 8799: resonance and masses». Astrophys.J.710:1408-1421,2010. 710 (2): 1408–1421. Bibcode:2010ApJ...710.1408F. arXiv:0812.0011. doi:10.1088/0004-637X/710/2/1408 !CS1 manut: Uso explícito de et al. (link)
Lafrenière; Marois, Christian; Doyon, René; Barman, Travis; et al. (18 de fevereiro de 2009). «HST/NICMOS detection of HR 8799 b in 1998». The Astrophysical Journal. 694 (2): L148–L152. arXiv:0902.3247. doi:10.1088/0004-637X/694/2/L148 !CS1 manut: Uso explícito de et al. (link)
Fabrycky; Murray-Clay; et al. (1 de dezembro de 2008). «Stability of the directly imaged multiplanet system HR 8799: resonance and masses». Astrophys.J.710:1408-1421,2010. 710 (2): 1408–1421. Bibcode:2010ApJ...710.1408F. arXiv:0812.0011. doi:10.1088/0004-637X/710/2/1408 !CS1 manut: Uso explícito de et al. (link)