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Röttger, K.; Wang, S.; Renth, F.; Bahrenburg, J.; Temps, F. . (2015). A femtosecond pump–probe spectrometer for dynamics in transmissive polymer films. Applied Physics B, 118(2), 185–193. doi:10.1007/s00340-014-5967-y 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research