Machado, J., Guojie Bian, Nancy Paul, M. Trassinelli, P. Amaro, M. Guerra, C. I. Szabo, A. Gumberidze, J. M. Isac, J. P. Santos, J. P. Desclaux, and P. Indelicato. "{Reference-free measurements of the 1s2s2p2P1/2,3/2o$\rightarrow$1s22s2S1/2and 1s2s2p4P5/2$\rightarrow$1s22s2S1/2transition energies and widths in lithiumlike sulfur and argon ions}." Physical Review A. 101 (2020): 062505.