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BENEDICT, G. Fritz; MCARTHUR, B. E.; FREDRICK, L. W., et al. Astrometry with The Hubble Space Telescope: A Parallax of the Central Star of the Planetary Nebula NGC 6853. S. 2549–2556. Astronomical Journal [online]. Listopad 2003 [cit. 2018-09-06]. Roč. 126, čís. 5, s. 2549–2556. Dostupné online. arXivastro-ph/0307449. DOI10.1086/378603. Bibcode2003AJ....126.2549B. (anglicky)