Electromagnetic local density of states in graphene-covered hyperbolic metamaterial Chen-Cai Song, Tong-Biao Wang, Qing-Hua Liao, Tian-Bao Yu and Nian-Hua Liu Eur. Phys. J. B, 90 10 (2017) 198 Published online: 16 October 2017 DOI: 10.1140/epjb/e2017-80407-x