1. Penrose, R. (1979) Singularities and Time-Assymetry. In: Hawking, S. and Israel, W., Eds., General Relativity; An Einstein Centenary Survey, Cambridge University Press, Cambridge, 581-638. https://personal.lse.ac.uk/robert49/PPB/pdf/Penrose1979a.pdf
2. Lincoln, D. (2021, January 5) Crisis in Cosmology Gets Worse. http://forbes.com https://www.forbes.com/sites/drdonlincoln/2021/01/05/crisis-in-cosmology-gets-worse/?sh=7c9b49cd2826
3. In the realm of the Hubble tension—a review of solutions
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4. Sloman, L. (2019, July 29) Hubble Tension Headache: Clashing Measurements Make the Universe’s Expansion a Lingering Mystery. Scientific American.https://www.scientificamerican.com/article/hubble-tension-headache-clashing-measurements-make-the-universes-expansion-a-lingering-mystery/
5. On the Hubble Constant Tension in the SNe Ia Pantheon Sample