Exploring interacting holographic dark energy in a perturbed universe with parameterized post-Friedmann approachLu Feng, Yun-He Li, Fei Yu, Jing-Fei Zhang and Xin ZhangEur. Phys. J. C, 78 10 (2018) 865DOI: https://doi.org/10.1140/epjc/s10052-018-6338-3