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I. Sevilla; R. Ortiz; L. Perelló; J. Borrás; S. García-Granda; A. Aguirre. (1995). Phenobarbiturate complexes of copper(II). Crystal structure of Na2[Cu(phenobarbiturate)4] complex: A symmetric square planar CuN4 chromophore. , 57(2), 147–155. doi:10.1016/0162-0134(94)00023-4 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research