The influence of relativistic, Breit interaction, and QED effects on the 
and 
energy levels of Be-like (
) isoelectronic sequence
, , , , , , and
Eur. Phys. J. D, 77 7 (2023) 129
Published online: 06 July 2023
DOI: 10.1140/epjd/s10053-023-00709-2