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Vilchinska, Nora A.; Enflo, Bengt; Hedberg, Claes M.; Kari, Leif . (2008). [AIP NONLINEAR ACOUSTICS - FUNDAMENTALS AND APPLICATIONS: 18th International Symposium on Nonlinear Acoustics - ISNA 18 - Stockholm (Sweden) (7–10 July 2008)] AIP Conference Proceedings - Impact Induced Surface Wave Propagation In Concrete Massif. , 1022(), 323–326. doi:10.1063/1.2956221 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research