Robuta

https://pure.psu.edu/en/publications/twisting-and-bending-of-pretwisted-piezoelectric-plates/ Twisting and bending of pretwisted piezoelectric plates - Penn State twisting bending piezoelectric plates penn https://pure.psu.edu/en/publications/propagating-waves-and-end-modes-in-pretwisted-beams/ Propagating waves and end modes in pretwisted beams - Penn State propagating waves end modes beams