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Kharchenko, N. V.; Piskunov, A. E.; Röser, S.; Schilbach, E.; Scholz, R.-D. (2004). “Astrophysical supplements to the ASCC-2.5. II. Membership probabilities in 520 Galactic open cluster sky areas”. 《Astronomische Nachrichten》 325 (9): 740. Bibcode:2004AN....325..740K. doi:10.1002/asna.200410256.