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Lee, Donghyun; Park, Sungjo; Noh, Woo-Chang; Im, Jae-Seung; Kim, Chulhong . (2017). Photoacoustic imaging of dental implants in a porcine jawbone ex vivo. Optics Letters, 42(9), 1760–. doi:10.1364/OL.42.001760 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research