Peldschus K, Schultze A, Nollau P, Kaul M, Schumacher U, Wagener C, Adam G, Ittrich H. Quantitative MR imaging of targeted SPIO particles on the cell surface and comparison to flow cytometry. Magn Reson Imaging. 2010 May;28(4):599–606. doi: 10.1016/j.mri.2009.12.017. PMID: 20117898.