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Qin, Deru; Kean, Robert T.. (1998). Crystallinity Determination of Polylactide by FT-Raman Spectrometry. as/52/4/as-52-4-488.pdf, 52(4), 488–495. doi:10.1366/0003702981943950 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research