Removing krypton from xenon by cryogenic distillation to the ppq level E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, F. D. Amaro, M. Anthony, F. Arneodo, P. Barrow, L. Baudis, B. Bauermeister et al. (114 more) Eur. Phys. J. C, 77 5 (2017) 275 Published online: 02 May 2017 DOI: 10.1140/epjc/s10052-017-4757-1