Low-field mobilities of rare-earth metals M. Laatiaoui, H. Backe, D. Habs, P. Kunz, W. Lauth and M. Sewtz Eur. Phys. J. D, 66 9 (2012) 232 Published online: 06 September 2012 DOI: 10.1140/epjd/e2012-30221-3