Gorge, V. ., A. . Benjeddou, and R. . Ohayon. “A Sandwich Finite Element for the Analysis of Piezoelectric Adaptive Shells of Revolution”. European Journal of Computational Mechanics, vol. 11, no. 2-4, Nov. 2002, pp. 217-31, https://journals.riverpublishers.com/index.php/EJCM/article/view/2585.