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Andrew H. Huber; William I. Weis. (2001). The Structure of the β-Catenin/E-Cadherin Complex and the Molecular Basis of Diverse Ligand Recognition by β-Catenin. , 105(3), 0–402. doi:10.1016/s0092-8674(01)00330-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research