The anomalous stabilisation of the oxidation state 2+ of lanthanides and actinides
Nikolai Borisovich Mikheev, L N Auerman, Igor Andreevich Rumer, Alla Nikolaevna Kamenskaya, Mikhail Zinov'evich Kazakevich
Volume 61, Issue 10, 990-998
Communication , 30 November 1991