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Sivan, A.; van Moppes, D.; (Malis) Arad, S. . (1992). Protoplast production from the unicellular red alga Porphyridium sp. (UTEX 637) by an extracellular bacterial lytic preparation. Phycologia, 31(3/4), 253–261. doi:10.2216/i0031-8884-31-3-4-253.1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research