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839 Valborg 839 TCNTài liệu tham khảo
WikiPedia: 839_Valborg http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... http://cfa-www.harvard.edu/iau/lists/NumberedMPs.t... http://www.psi.edu/pds/archive/astdata04/simps04/d... http://www.psi.edu/pds/resource/family.html http://ssd.jpl.nasa.gov/horizons.cgi?find_body=1&b... http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=839;orb=1 http://en.wikipedia.org/wiki/Meanings_of_minor_pla...