Absorption and emission spectra of U4 + diluted in the incommensurate structure of ThCl4 C. Khan Malek, J.C. Krupa, P. Delamoye and M. Genet J. Phys. France, 47 10 (1986) 1763-1773 DOI: 10.1051/jphys:0198600470100176300