Lluma, Diego (May–June 2000). "Former Soviet Union: What the Russians left behind". Bulletin of the Atomic Scientists. 56 (3): 14–17. doi:10.2968/056003005. S2CID145248534.
"137 55Cs 82". WWW Table of Radioactive Isotopes. LBNL Isotopes Project - LUNDS Universitet. Archived from the original on 22 May 2015. Retrieved 14 March 2009.
OED entry for "caesium". Second edition, 1989; online version June 2012. Retrieved 7 September 2012. Earlier version first published in New English Dictionary, 1888.
Lluma, Diego (May–June 2000). "Former Soviet Union: What the Russians left behind". Bulletin of the Atomic Scientists. 56 (3): 14–17. doi:10.2968/056003005. S2CID145248534.
"137 55Cs 82". WWW Table of Radioactive Isotopes. LBNL Isotopes Project - LUNDS Universitet. Archived from the original on 22 May 2015. Retrieved 14 March 2009.
Caesium is the spelling recommended by the International Union of Pure and Applied Chemistry (IUPAC).[3] The American Chemical Society (ACS) has used the spelling cesium since 1921,[4][5] following Webster's New International Dictionary. The element was named after the Latin word caesius, meaning "bluish grey".[6] In medieval and early modern writings caesius was spelled with the ligatureæ as cæsius; hence, an alternative but now old-fashioned orthography is cæsium. More spelling explanation at ae/oe vs e.