↑ Asimov, Isaac (tháng 3 năm 1987). “The Incredible Shrinking Planet”. The Magazine of Fantasy and Science Fiction: 118–128.
1 2 Asimov, Isaac (1988). The Relativity of Wrong. tr. 121. ...my own suggestion is that everything from Mercury up be called a major planet; everything from Ceres down be called a minor planet; and everything between Mercury and Ceres be called a "mesoplanet" (from a Greek word for "intermediate"). At the moment, Pluto is the only mesoplanet known.
