Electro-hydrodynamic propulsion of counter-rotating Pickering drops P. Dommersnes, A. Mikkelsen and J.O. Fossum Eur. Phys. J. Special Topics, 225 4 (2016) 699-706 Published online: 15 July 2016 DOI: 10.1140/epjst/e2016-60090-2