Widdrat, M., Kumari, M., Tompa, E., Posfai, M., Hirt, A. M., & Faivre, D. (2014). Keeping nanoparticles fully functional: long-term storage and alteration of magnetite. ChemPlusChem, 79(8), 1225-1233. doi:10.1002/cplu.201402032.