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Zhen Ma; Zhongning Chen; Rong Cao. (2005). Two Novel Cadmium Polymeric Metallamacrocyclic Complexes Constructed from a Pyridylmethyl-Functionalized Tetraaza Ligand. , 2005(15), 2978–2981. doi:10.1002/ejic.200500288 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research