Relativistic configuration interaction calculations for the K X-ray transitions of Co XV to Co XXVI ions Liang-huan Hao, Hao Feng and Xiao-ping Kang Eur. Phys. J. D, 68 3 (2014) 42 Published online: 04 March 2014 DOI: 10.1140/epjd/e2014-40173-1