Direct interband transitions in tris-(8-hydroxyquinoline) aluminum thin films - Xu, X. L.; Xu, Z.; Hou, Y. B.; Chen, X. H.; Wang, Z. J.; Zhang, X. Q.; Xu, X. R. (American Institute of Physics (AIP), 2001)
http://dx.doi.org/10.1063/1.1334635
Keywords: U