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GARCIA, A. General study of group membership. II - Determination of nearby groups. S. 47–90. Astronomy and Astrophysics Supplement [online]. Červenec 1993 [cit. 2020-03-31]. Roč. 100, s. 47–90. Dostupné online. Bibcode1993A&AS..100...47G. (anglicky)
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