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Furukawa, Yoshiaki; Nakayama, Masaaki . (2018). Evidence for Spatial Propagation of Photon-like Polaritons Generated by Exciton–Exciton Scattering in a GaAs/AlAs Multiple-Quantum-Well Structure. Journal of the Physical Society of Japan, 87(9), 094718–. doi:10.7566/JPSJ.87.094718 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research