Effects of the strong Breit interaction on the 2s2p–1s2s transitions of inner-shell hole states of helium-like ionsCunqiang Wu, Runxia Zhao, Denghong Zhang, Mingwu Zhang, Yingli Xue, Deyang Yu, Chenzhong Dong and Xiaobin DingEur. Phys. J. D, 79 5 (2025) 42DOI: https://doi.org/10.1140/epjd/s10053-025-00992-1