Citation: Liu, Zhi-Bo; He, Lei; Shi, Ping-Ping; Ye, Qiong; Fu, Da-Wei (2020). A Three-Dimensional Molecular Perovskite Ferroelastic with Two-Step Switching of Quadratic Nonlinear Optical Properties Tuned by Molecular Chiral Design.. The journal of physical chemistry letters, 11, pp. 7960-7965.