Synthesis of γ-Fe2O3 nanoparticles coated on silica spheres: Structural and magnetic propertiesS. Chakrabarti, S. K. Mandal, B. K. Nath, D. Das, D. Ganguli and S. ChaudhuriEur. Phys. J. B, 34 2 (2003) 163-171DOI: https://doi.org/10.1140/epjb/e2003-00208-2