@article {Liu:2021wap,
	title = {Challenges for a QCD Axion at the 10 MeV Scale},
	journal = {JHEP},
	volume = {05},
	year = {2021},
	pages = {138},
	doi = {10.1007/JHEP05(2021)138},
	author = {Jia Liu and McGinnis, Navin and Wagner, Carlos E. M. and Wang, Xiao-Ping}
}
