Timakov, A. A.; Prusakov, V. N.; Drobyshevskii, Yu. V.
Kinetics and Catalysis, 1982 , vol. 23, p. 889 - 892
Kinetika i Kataliz, 1982 , vol. 23, p. 1048 - 1051

Bartlett, N.
Chemical and Engineering News, 1963 , vol. 41, # Feb. 4 p. 38 - 38
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Gmelin Handbook: He: Edelgasverb., 1.7.1.2.1, page 18 - 19
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Streng, A. G.; Kirshenbaum, A. D.; Streng, L. V.; Grosse, A. V.
Noble-Gas Compounds, Chicago 1963, S. 73