26. Chao Zhang, Zhi Li, Jincheng Zhuang, Li Wang, Haifeng Feng, Xun Xu, Zhenpeng Hu, Shi Xue Dou, Xiaolin Wang, Yi Du, Kehui Wu, Lan Chen, Qian Gao, Realization of Flat Band with Possible Nontrivial Topology in Electronic Kagome Lattice, SCIENCE ADVANCES 4, 4511 (2018).