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Zhao, Zuo-Quan; Yang, Yong; Fang, Wei; Liu, Shuang . (2016). Comparison of biological properties of 99mTc-labeled cyclic RGD Peptide trimer and dimer useful as SPECT radiotracers for tumor imaging. Nuclear Medicine and Biology, (), S096980511630018X–. doi:10.1016/j.nucmedbio.2016.02.006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research