Falsi  L., M., Aversa , Di Mei, F. , Pierangeli, D , F., Xin , Agranat, A.J. , and DelRe, E. . 2021. ?Direct Observation Of Fractal-Dimensional Percolation In The 3D Cluster Dynamics Of A Ferroelectric Super-Crystal?. Phys. Rev. Lett., 126.