Is N = 40 magic? An analysis of ISOLTRAP mass measurements C. Guénaut, G. Audi, D. Beck, K. Blaum, G. Bollen, P. Delahaye, F. Herfurth, A. Kellerbauer, H. -J. Kluge, D. Lunney et al. (3 more) Eur. Phys. J. A, 25 3 (2005) 33-34 Published online: 20 April 2005 DOI: 10.1140/epjad/i2005-06-029-9