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Wang, Youfa; Lee, Ching-Kwang; Kuang, Jinlu. (2001). Phase jump in an optical directional coupler. josab/18/11/josab-18-11-1554.pdf, 18(11), 1554–0. doi:10.1364/JOSAB.18.001554 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research