Resonance enhanced electron impact excitation of Cu-like gadoliniumShuang Li, Ran Si, Chun yu Zhang, Xue Ling Guo, Zhan Bin Chen, Kai Wang, Chong Yang Chen and Jun YanEur. Phys. J. D, 71 6 (2017) 156DOI: https://doi.org/10.1140/epjd/e2017-70779-4