Relativistic Bethe logarithm for triplet states of helium-like ionsVladimir A. Yerokhin, Vojtěch Patkóš and Krzysztof PachuckiEur. Phys. J. D, 76 8 (2022) 142DOI: https://doi.org/10.1140/epjd/s10053-022-00474-8