In-medium k-body reduction of n-body operators - A flexible symmetry-conserving approach based on the sole one-body density matrixM. Frosini, T. Duguet, B. Bally, Y. Beaujeault-Taudière, J.-P. Ebran and V. SomàEur. Phys. J. A, 57 4 (2021) 151DOI: https://doi.org/10.1140/epja/s10050-021-00458-z