Carbon clusters for absolute mass measurements at ISOLTRAP K. Blaum, G. Bollen, F. Herfurth, A. Kellerbauer, H.-J. Kluge, M. Kuckein, E. Sauvan, C. Scheidenberger and L. Schweikhard Eur. Phys. J. A, 15 1-2 (2002) 245-248 Published online: 31 October 2002 DOI: 10.1140/epja/i2001-10262-4