Superallowed 0+ → 0+ β decay and CKM unitarity: A new overview including more exotic nuclei J. C. Hardy and I. S. Towner Eur. Phys. J. A, 25 3 (2005) 695-698 Published online: 30 June 2005 DOI: 10.1140/epjad/i2005-06-109-x