Viscous effect in the late time evolution of phantom universe Jing Yang, Rui-Hui Lin, Chao-Jun Feng and Xiang-Hua Zhai Eur. Phys. J. C, 83 12 (2023) 1155 Published online: 19 December 2023 DOI: 10.1140/epjc/s10052-023-12330-z