Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). "Noble Gases". Kirk Othmer Encyclopedia of Chemical Technology. Wiley. pp. 343–383. doi:10.1002/0471238961.0701190508230114.a01.
{{Cite book|url=https://www.worldcat.org/oclc/56111623%7Ctitle=Van Nostrand's encyclopedia of chemistry.|others=Considine, Glenn D.|date=3 February 2005|isbn=0-471-61525-0|edition=5th|location=Hoboken, NJ|oclc=56111623|access-date=20 September 2020}