Lepton collider indirect signatures of dark CP-violation A. Cordero-Cid, J. Hernández-Sánchez, V. Keus, S. Moretti, D. Rojas and D. Sokołowska Eur. Phys. J. C, 80 2 (2020) 135 Published online: 17 February 2020 DOI: 10.1140/epjc/s10052-020-7689-0