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Huang, Chao-Yi; Sun, Jia-Hong; Wu, Tsung-Tsong . (2010). A two-port ZnO/silicon Lamb wave resonator using phononic crystals. Applied Physics Letters, 97(3), 031913–. doi:10.1063/1.3467145 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research