Resonant level lifetime in GaAs-AlAs double-barrier structures including Γ-X mixing - Zheng, T. F.; Cai, W.; Hu, P.; Lax, M.; Shum, Kai; Alfano, R. R. (American Institute of Physics (AIP), 1991)
http://dx.doi.org/10.1063/1.348923
Keywords: U