Approximate energy functionals for one-body reduced density matrix functional theory from many-body perturbation theoryKlaas J.H. Giesbertz, Anna-Maija Uimonen and Robert van LeeuwenEur. Phys. J. B, 91 11 (2018) 282DOI: https://doi.org/10.1140/epjb/e2018-90279-1