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De Lucia, Jr., Frank C.; Harmon, Russell S.; McNesby, Kevin L.; Winkel, Jr., Raymond J.; Miziolek, Andrzej W.. (2003). Laser-Induced Breakdown Spectroscopy Analysis of Energetic Materials. ao/42/30/ao-42-30-6148.pdf, 42(30), 6148–0. doi:10.1364/AO.42.006148 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research