Electron impact excitation of Na-like Cu XIX using the Breit–Pauli R-matrix methodMayank Dimri, Dishu Dawra, A. K. Singh, Alok K. S. Jha, Rakesh Kumar Pandey, Rinku Sharma and Man MohanEur. Phys. J. D, 75 5 (2021) 157DOI: https://doi.org/10.1140/epjd/s10053-021-00157-w