1. Wu C. et al. Biodistribution and Catabolism of Ga-67-Labeled Anti-Tac dsFv Fragment. Bioconjugate Chem. 1997, 8, 365-369. 2. Prata M. et al. Structural and in vivo studies of metal chelates of Ga (III) relevant to biomedical imaging. J. Inorg. Biochem. 2000, 79, 359?363. 3. Hoigebazar L. et al. Synthesis and Characterization of Nitroimidazole Derivatives for 68Ga-Labeling and Testing in Tumor Xenografted Mice. J. Med. Chem. 2010, 53, 6378?6385. 4. Hwang D. W. et al. A Nucleolin-Targeted Multimodal Nanoparticle Imaging Probe for Tracking Cancer Cells Using an Aptamer. J. Nucl. Med. 2010, 51, 98?105.