"Why there is something rather than nothing: The finite, infinite and eternal". arXiv:1205.2720 . ↑ "What if the universe had no beginning?". earthsky.org. Retrieved 26 April 2017. ↑ "Kosmologie: Quantentrick schafft Urknall-Singularität ab" (in German). Retrieved 26 April 2017. ↑ "Ein Universum ohne Urknall, Dunkle Materie und Dunkle Energie".