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Shen, Jung-Tsung; Fan, Shanhui . (2005). Coherent Single Photon Transport in a One-Dimensional Waveguide Coupled with Superconducting Quantum Bits. Physical Review Letters, 95(21), 213001–. doi:10.1103/PhysRevLett.95.213001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research