Fixsen, Dale; Mather, John (2002). “The Spectral Results of the Far-Infrared Absolute Spectrophotometer Instrument on COBE”. Astrophysical Journal581 (2): 817-822. Bibcode: 2002ApJ...581..817F. doi:10.1086/344402.
Fixsen, Dale; Mather, John (2002). “The Spectral Results of the Far-Infrared Absolute Spectrophotometer Instrument on COBE”. Astrophysical Journal581 (2): 817-822. Bibcode: 2002ApJ...581..817F. doi:10.1086/344402.