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Lämmlein, Sarah L.; Mannes, David; Van Damme, Bart; Schwarze, Francis W. M. R.; Burgert, Ingo . (2019). The influence of multi-layered varnishes on moisture protection and vibrational properties of violin wood. Scientific Reports, 9(1), 18611–. doi:10.1038/s41598-019-54991-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research