Relativistic calculations of photoionization cross-section of Mg-like Ca IXNarendra Kumar, Shivankar, Dishu Dawra, Mayank Dimri, Man Mohan and Alok Kumar Singh JhaEur. Phys. J. Plus, 139 10 (2024) 929DOI: https://doi.org/10.1140/epjp/s13360-024-05716-9