1. Valeria Pettorino, et al., “Planck 2015 results: dark energy and modified gravity,” Astronomy & Astrophysics, February 2015.
2. Shan Gao, “Why gravity is not an entropic force,” http://philsci-archive.pitt.edu/id/eprint/8383, 2011.
3. John Wheeler & Wojciech Zurek (editors), “Quantum theory and measurement,” Princeton University Press, 1983.
4. P. James E. Peebles, “Principles of physical cosmology,” Princeton University Press, 1993.
5. Beethoven Santos, et al., “Current constraints on the epoch of cosmic acceleration,” arXiv:1009.2733v1, Nov. 2013.