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Neal Dalal et al. Short GRB and binary black hole standard sirens as a probe of dark energy. „Physical Review D”. 74 (063006), 2006-09-18. DOI: 10.1103/PhysRevD.74.063006. arXiv:astro-ph/0601275. (ang.).
Timothy Clifton, Pedro G. Ferreira, Kate Land. Living in a Void: Testing the Copernican Principle with Distant Supernovae. „Physical Review Letters”. 101 (131302), 2008-09-26. DOI: 10.1103/PhysRevLett.101.131302. arXiv:0807.1443. (ang.).