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Raghavan, Ajay; Cesnik, Carlos E S . (2005). Finite-dimensional piezoelectric transducer modeling for guided wave based structural health monitoring. Smart Materials and Structures, 14(6), 1448–1461. doi:10.1088/0964-1726/14/6/037 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research