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Penzias, A.A.; Wilson, R.W. (1965). „A Measurement of Excess Antenna Temperature at 4080 Mc/s”. Astrophysical Journal142: 419. Bibcode1965ApJ...142..419P. DOI:10.1086/148307.
Boggess, N.W.; et al. (1992). „The COBE Mission: Its Design and Performance Two Years after the launch”. Astrophysical Journal397: 420. Bibcode1992ApJ...397..420B. DOI:10.1086/171797.
Schewe, P. (2005). „An Ocean of Quarks”. Physics News Update (American Institute of Physics) 728 (1). Arhivirano iz originala na datum 2005-04-23. Pristupljeno 2015-04-26.