Enhanced tripartite entanglement via atomic coherence in atom-optomechanical system Xuping Shao, Zhiyong Yin, Zhenghong Li and Xihua Yang Eur. Phys. J. D, 73 11 (2019) 247 Published online: 26 November 2019 DOI: 10.1140/epjd/e2019-100390-2