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Leng, Ni; Jiang, Lan; Li, Xin; Xu, Chuancai; Liu, Pengjun; Lu, Yongfeng . (2012). Femtosecond laser processing of fused silica and aluminum based on electron dynamics control by shaping pulse trains. Applied Physics A, 109(3), 679–684. doi:10.1007/s00339-012-7098-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research