Meson cloud and SU(3) symmetry breaking in parton distributions F. Carvalho, F.O. Durães, F.S. Navarra, M. Nielsen and F.M. Steffens Eur. Phys. J. C, 18 1 (2000) 127-136 Published online: 23 October 2000 DOI: 10.1007/s100520000512