C, S, Zn and Cu abundances in planet-harbouring stars A. Ecuvillon, G. Israelian, N. C. Santos, M. Mayor, V. Villar and G. Bihain A&A, 426 2 (2004) 619-630 Published online: 11 October 2004 DOI: 10.1051/0004-6361:20041136