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Allègre, Claude; Manhès, Gérard; Lewin, Éric (2001). „Chemical composition of the Earth and the volatility control on planetary genetics”. Earth and Planetary Science Letters. 185 (1–2): 49—69. Bibcode:2001E&PSL.185...49A. doi:10.1016/S0012-821X(00)00359-9.
Wieser, Michael E.; Coplen, Tyler B. (2010). „Atomic weights of the elements 2009 (IUPAC Technical Report)”. Pure and Applied Chemistry. 83 (2): 359—396. S2CID95898322. doi:10.1351/PAC-REP-10-09-14.
„XXXVIII. An account of further discoveries in air. By the Rev. Joseph Priestley, LL.D. F.R.S. In letter to Sir John Pringle, Bart. P.R.S. And the Rev. Dr. Price, F.R.S”. Philosophical Transactions of the Royal Society of London. 65: 384—394. 1775. S2CID186214794. doi:10.1098/rstl.1775.0039.