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Peik, E; Tamm, Chr . (2003). Nuclear laser spectroscopy of the 3.5 eV transition in Th-229. Europhysics Letters (EPL), 61(2), 181–186. doi:10.1209/epl/i2003-00210-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research