Zuev, A. L., and Y. V. Novikova. “Estimation of the Reachable Set for the Problem of Vibrating Kirchhoff Plate”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 66, no. 11, Nov. 2014, pp. 1463-76, https://umj.imath.kiev.ua/index.php/umj/article/view/2238.