Biocompatible superparamagnetic iron oxide nanoparticles (SPION) used for contrast agents: a structural and magnetic study - Gamarra, Lionel Fernel; Brito, Giancarlo Espósito de Souza; Pontuschka, Walter Maigon; Goya, Gerardo Fabían; Amaro Júnior, Edson; Parma, Alexandre H C (International Conference on Magnetic Fluids, 2004)