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Kong, Choon Yen; Soar, Rupert. (2005). Method for embedding optical fibers in an aluminum matrix by ultrasonic consolidation. ao/44/30/ao-44-30-6325.pdf, 44(30), 6325–0. doi:10.1364/AO.44.006325 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research