D. N. Spergel, et al.. “First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters”. The Astrophysical Journal Supplement Series148 (1): 175-194. arXiv:astro-ph/0302209. doi:10.1086/377226.
Planck collaboration. Planck 2018 results. VI. Cosmological parameters. arXiv:1807.06209.
D. N. Spergel, et al.. “First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters”. The Astrophysical Journal Supplement Series148 (1): 175-194. arXiv:astro-ph/0302209. doi:10.1086/377226.