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John A. Thoma; Gudimetla V.K. Rao; Alexander Bowanko; Allen L. Jennings; Carloyn Crook. (1974). Stable lysozyme-cello-oligosaccharide complexes. , 38(none), 279–292. doi:10.1016/s0008-6215(00)82358-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research