Analysis of information sources in references of the Wikipedia article "超光速運動" in Chinese language version.
|title=
为空 (帮助) ; Biretta, J. A.; Sparks, W. B.; MacChetto, F. Hubble Space TelescopeObservations of Superluminal Motion in the M87 Jet. The Astrophysical Journal. 1999, 520 (2): 621. Bibcode:1999ApJ...520..621B. doi:10.1086/307499.|title=
为空 (帮助)|title=
为空 (帮助) ; Biretta, J. A.; Sparks, W. B.; MacChetto, F. Hubble Space TelescopeObservations of Superluminal Motion in the M87 Jet. The Astrophysical Journal. 1999, 520 (2): 621. Bibcode:1999ApJ...520..621B. doi:10.1086/307499.|title=
为空 (帮助)