1. Astronomers find first evidence of other universe,2010
2. The case for parallel universes;Tegmark,2011
3. Is our universe inside a bubble? First observational test of the ’multiverse’;Sci. Daily,2011
4. Cycles of time: An extraordinary new view of the universe – review;Kirkus Rev.,2011
5. Daniel An, Krzysztof A. Meissner, Pawel Nurowski, Roger Penrose, https://arxiv.org/abs/1808.01740v4.