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Sellyei, M.; Kiss, Gabriella; Backhausz, R. . (1969). IMMUNOGLOBULIN DEFICIENCY AND POLYPLOIDY. The Lancet, 294(7634), 1365–. doi:10.1016/S0140-6736(69)90907-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research