AJ Heroux: Smith’s Cloud (HVC) in 21 cm HI emission. In: Bulletin of the American Astronomical Society. 38. Jahrgang. American Astronomical Society, Dezember 2006, S.1149, bibcode:2006AAS...20917213H: „we have used the Green Bank Telescope (GBT) of the NRAO to measure the 21 cm HI emission from a specific high velocity cloud known as “Smith’s Cloud”“