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Avery, Steven G.; Chowdhury, Borun D.; Puhm, Andrea (2013). “Unitarity and fuzzball complementarity: "Alice fuzzes but may not even know it!"”. 《Journal of High Energy Physics》 2013 (9): 12. arXiv:1210.6996. Bibcode:2013JHEP...09..012A. doi:10.1007/JHEP09(2013)012.
Mera;o, Zeeya (2016). “LIGO black hole echoes hint at general-relativity breakdown”. 《Nature》 540. doi:10.1038/nature.2016.21135.
Westerweck, Julian; Nielsen, Alex B.; Fischer-Birnholtz, Ofek; Cabero, Miriam; Capano, Collin; Dent, Thomas; Krishnan, Badri; Meadors, Grant; Nitz, Alexander H. (2018년 6월 15일). “Low significance of evidence for black hole echoes in gravitational wave data”. 《Physical Review D》 97 (12): 124037. arXiv:1712.09966. Bibcode:2018PhRvD..97l4037W. doi:10.1103/PhysRevD.97.124037.
Lubkin, Elihu (1978년 5월 1일). “Entropy of an n‐system from its correlation with a k‐reservoir”. 《Journal of Mathematical Physics》 19 (5): 1028–1031. Bibcode:1978JMP....19.1028L. doi:10.1063/1.523763.
Avery, Steven G.; Chowdhury, Borun D.; Puhm, Andrea (2013). “Unitarity and fuzzball complementarity: "Alice fuzzes but may not even know it!"”. 《Journal of High Energy Physics》 2013 (9): 12. arXiv:1210.6996. Bibcode:2013JHEP...09..012A. doi:10.1007/JHEP09(2013)012.
Westerweck, Julian; Nielsen, Alex B.; Fischer-Birnholtz, Ofek; Cabero, Miriam; Capano, Collin; Dent, Thomas; Krishnan, Badri; Meadors, Grant; Nitz, Alexander H. (2018년 6월 15일). “Low significance of evidence for black hole echoes in gravitational wave data”. 《Physical Review D》 97 (12): 124037. arXiv:1712.09966. Bibcode:2018PhRvD..97l4037W. doi:10.1103/PhysRevD.97.124037.