The influence of magnetic field on refractive index profile of ferronematic cell C. Tyszkiewicz, T. Pustelny and E. Nowinowski-Kruszelnicki Eur. Phys. J. Special Topics, 154 (2008) 221-224 Published online: 15 March 2008 DOI: 10.1140/epjst/e2008-00549-6