Van-der-Waals interaction of atoms in dipolar Rydberg states Aleksandr A. Kamenski, Sergey N. Mokhnenko and Vitaly D. Ovsiannikov Eur. Phys. J. D, 72 2 (2018) 28 Published online: 06 February 2018 DOI: 10.1140/epjd/e2017-80477-x