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Huang, Yi-Yi; Lai, Xuan-Yang; Liu, Xiao-Jun . (2018). High-order harmonic generation in a two-color strong laser field with Bohmian trajectory theory. Chinese Physics B, 27(7), 073204–. doi:10.1088/1674-1056/27/7/073204 

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