Relativistic electron-correlation on the 2p-2s transitions in Li-like to F-like Xe ions Liang-huan Hao, Jing-jing Liu and Xiao-ping Kang Eur. Phys. J. Plus, 131 6 (2016) 204 Published online: 21 June 2016 DOI: 10.1140/epjp/i2016-16204-6