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Cepeda, Nicholas J.; Vul, Edward; Rohrer, Doug; Wixted, John T.; Pashler, Harold . (2008). Spacing Effects in Learning: A Temporal Ridgeline of Optimal Retention. Psychological Science, 19(11), 1095–1102. doi:10.1111/j.1467-9280.2008.02209.x 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research