From direct to absolute mass measurements: A study of the accuracy of ISOLTRAP A. Kellerbauer, K. Blaum, G. Bollen, F. Herfurth, H.-J. Kluge, M. Kuckein, E. Sauvan, C. Scheidenberger and L. Schweikhard Eur. Phys. J. D, 22 1 (2003) 53-64 Published online: 06 November 2002 DOI: 10.1140/epjd/e2002-00222-0