Ultrasmall superparamagnetic iron oxide: characterization of a new class of contrast agents for MR imaging.Ralph Weissleder, Lee Josephson, G Elizondo et al.|Radiology|1990Cited by 1k
Cell-specific targeting of nanoparticles by multivalent attachment of small moleculesRalph Weissleder, Lee Josephson, Kimberly M. Kelly et al.|Nature Biotechnology|2005Cited by 902
Magnetic relaxation switches capable of sensing molecular interactionsJuan Manuel Sánchez Pérez, Ralph Weissleder, Lee Josephson et al.|Nature Biotechnology|2002Cited by 892
High-Efficiency Intracellular Magnetic Labeling with Novel Superparamagnetic-Tat Peptide ConjugatesLee Josephson, Ralph Weissleder, Ching‐Hsuan Tung et al.|Bioconjugate Chemistry|1999Cited by 881
A multimodal nanoparticle for preoperative magnetic resonance imaging and intraoperative optical brain tumor delineation.Moritz F. Kircher, Lee Josephson, Umar Mahmood et al.|PubMed|2003Cited by 549