Relativistic R-matrix calculations of photoionization cross sections of Cu XVIII Avnindra K. Singh, Dishu Dawra, Mayank Dimri, Alok K. S. Jha and Man Mohan Eur. Phys. J. D, 73 5 (2019) 85 Published online: 02 May 2019 DOI: 10.1140/epjd/e2019-90464-x