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Bei Lu; Olivia S. Mitchell; John Piggott. (2008). Notional defined contribution pensions with public reserve funds in ageing economies: An application to Japan. , 61(4), 1–23. doi:10.1111/j.1468-246x.2008.00321.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research