ثقب أسود فائق: الفرق بين النسختين

| last = Bender | first = Ralf | coauthors = ''et al.''

| title = HST STIS Spectroscopy of the Triple Nucleus of M31: Two Nested Disks in Keplerian Rotation around a Supermassive Black Hole

| volume = 631 | issue = 1 | pages = 280–300

| date = 2005-09-20

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