@article {Liu:2017zdh,
	title = {Exposing the dark sector with future Z factories},
	journal = {Phys. Rev. D},
	volume = {97},
	number = {9},
	year = {2018},
	pages = {095044},
	doi = {10.1103/PhysRevD.97.095044},
	author = {Jia Liu and Wang, Lian-Tao and Wang, Xiao-Ping and Xue, Wei}
}
