Effects of the particle-number projection on the isovector pairing energy N. H. Allal, M. Fellah, M. R. Oudih and N. Benhamouda Eur. Phys. J. A, 27 1 (2006) 301-306 Published online: 13 March 2006 DOI: 10.1140/epja/i2006-08-046-1