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Dai, Yu-Mei; Ma, En; Tang, En; Zhang, Jian; Li, Zhao-Ji; Huang, Xu-Dong; Yao, Yuan-Gen . (2005). Paratactic Assembly of Two Distinct Units into a Unique 3D Architecture. Crystal Growth & Design, 5(4), 1313–1315. doi:10.1021/cg0500425 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research