Sum-rules of the response potential in the strongly-interacting limit of DFT Sara Giarrusso, Paola Gori-Giorgi and Klaas J.H. Giesbertz Eur. Phys. J. B, 91 8 (2018) 186 Published online: 03 August 2018 DOI: 10.1140/epjb/e2018-90301-8