Entanglement Structure: Entanglement Partitioning in Multipartite Systems and Its Experimental Detection Using Optimizable Witnesses - Lu, He; Zhao, Qi; Li, Zheng-Da; Yin, Xu-Fei; Yuan, Xiao; Hung, Jui-Chen; Chen, Luo-Kan; Li Li; Liu, Nai-Le; Peng, Cheng-Zhi (Physical Review X, 2018)