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Wu, X., Hu, S., Tan, C., & Liu, Y. (2014). Enhanced red luminescence in Gd2O3:Eu3+,Sm3+ and its dependence on temperature. Optics Communications, 328, 23–29. doi:10.1016/j.optcom.2014.04.051 
10.1016/j.optcom.2014.04.051