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Importance of the completeness of the configuration interaction and close coupling expansions inR-matrix calculations for highly charged ions: electron-impact excitation of Fe20+
L Fernández-Menchero, A S Giunta, G Del Zanna and N R Badnell Journal of Physics B: Atomic, Molecular and Optical Physics 49(8) 085203 (2016) https://doi.org/10.1088/0953-4075/49/8/085203