Crown oxygen-doping graphene with embedded main-group metal atomsLiyuan Wu, Qian Wang, Chuanghua Yang, Ruge Quhe, Pengfei Guan and Pengfei LuEur. Phys. J. B, 91 2 (2018) 46DOI: https://doi.org/10.1140/epjb/e2018-80396-2