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Hans Paulsen; Wolfram Kutschker. (1983). Synthese von β-l-rhamnosidisch verknüpften oligosacchariden des lipopolysaccharides aus Shigella flexneri sero-typ 6. , 120(none), 25–42. doi:10.1016/0008-6215(83)88004-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research