1. Planck collaboration, P.A.R. Ade et al., Planck 2013 results. I. Overview of products and scientific results, Astron. Astrophys. 571 (2014) A1 [ arXiv:1303.5062 ] [ INSPIRE ].
2. R.H. Cyburt, B.D. Fields, K.A. Olive and E. Skillman, New BBN limits on physics beyond the standard model from 4 He, Astropart. Phys. 23 (2005) 313 [ astro-ph/0408033 ] [ INSPIRE ].
3. R.H. Cyburt, B.D. Fields, K.A. Olive and T.-H. Yeh, Big Bang Nucleosynthesis: 2015, Rev. Mod. Phys. 88 (2016) 015004 [ arXiv:1505.01076 ] [ INSPIRE ].
4. Planck collaboration, P.A.R. Ade et al., Planck 2013 results. XVI. Cosmological parameters, Astron. Astrophys. 571 (2014) A16 [ arXiv:1303.5076 ] [ INSPIRE ].
5. F.-Y. Cyr-Racine, R. de Putter, A. Raccanelli and K. Sigurdson, Constraints on Large-Scale Dark Acoustic Oscillations from Cosmology, Phys. Rev. D 89 (2014) 063517 [ arXiv:1310.3278 ] [ INSPIRE ].