M.P. Lahalle, J.C. Krupa, R. Guillaumont, C. Rizzoli. Optical spectroscopy of Np4+ (5f3) ion diluted in ThSiO$_4$ and ThO$_2$ crystalline hosts.
International Conference on Actinides Actinides '85, Sep 1985, Aix-En-Provence, France. pp.65-73.
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