Glycyrrhetinic acid functionalized graphene oxide for mitochondria targeting and cancer treatment in vivo - Zhang, C; Liu, Z F; Zheng, Y; Geng, Y D; Han, C; Shi, Y M; Sun, H B; Zhang, C; Chen, Y J; Zhang, L Y; Guo, Q L; Yang, L; Zhou, X; Kong, L Y (Small, 2018)