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CELOTTI, A.; MILLER, J. C.; SCIAMA, D. W. Astrophysical evidence for the existence of black holes. Classical and Quantum Gravity. 1999-01-01, roč. 16, čís. 12A, s. A3. Dostupné online [cit. 2016-07-14]. ISSN0264-9381. DOI10.1088/0264-9381/16/12A/301. (anglicky)