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DellaCorte, Christopher; Radil, Kevin C.; Bruckner, Robert J.; Howard, S. Adam . (2008). Design, Fabrication, and Performance of Open Source Generation I and II Compliant Hydrodynamic Gas Foil Bearings. Tribology Transactions, 51(3), 254–264. doi:10.1080/10402000701772579 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research