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Chen, Zongqiang; Chen, Jing; Li, Yudong; Pan, Deng; Lu, Wenqiang; Hao, Zhiqiang; Xu, Jingjun; Sun, Qian . (2012). Simulation of Nanoscale Multifunctional Interferometric Logic Gates Based on Coupled Metal Gap Waveguides. IEEE Photonics Technology Letters, 24(16), 1366–1368. doi:10.1109/LPT.2012.2202283 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research