Systematics of half-lives for proton radioactivity E. L. Medeiros, M. M. N. Rodrigues, S. B. Duarte and O. A. P. Tavares Eur. Phys. J. A, 34 4 (2007) 417-427 Published online: 24 January 2008 DOI: 10.1140/epja/i2007-10513-4