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Xue, Yan; Jiang, Yan; Wang, Gang; Wang, Rong; Feng, Shouhua; Matuszewski, Michał . (2018). Creation of stable dark and anti-dark solitons in polariton dyad. Optics Express, 26(5), 6267–. doi:10.1364/oe.26.006267 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research