Weak surface energy in nematic dispersions: Saturn ring defects and quadrupolar interactions O. Mondain-Monval, J. C. Dedieu, T. Gulik-Krzywicki and P. Poulin Eur. Phys. J. B, 12 2 (1999) 167-170 Published online: 15 November 1999 DOI: 10.1007/s100510050992