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YUI, Hiroharu; HIROSE, Yasushi; SAWADA, Tsuguo . (2004). New Approaches to Liquid Interfaces through Changes in the Refractive Index and Nonlinear Susceptibility Utilizing Ultrashort Laser Pulses. Analytical Sciences, 20(11), 1493–1499. doi:10.2116/analsci.20.1493 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research