Tài liệu tham khảo WikiPedia: 157_Dejanira ftp://ftp.lowell.edu/pub/elgb/astorb.html http://cfa-www.harvard.edu/iau/lists/NumberedMPs.h... http://ssd.jpl.nasa.gov/ http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=157
