Ellis wormholes in anti-de Sitter space Jose Luis Blázquez-Salcedo, Xiao Yan Chew, Jutta Kunz and Dong-han Yeom Eur. Phys. J. C, 81 9 (2021) 858 Published online: 30 September 2021 DOI: 10.1140/epjc/s10052-021-09645-0