@article {paper2,
	title = {Exotic $U(1)$ Symmetries, Duality, and Fractons in 3+1-Dimensional Quantum Field Theory},
	journal = {arXiv:2004.00015},
	year = {2020},
	month = {Mar},
	author = {Seiberg, Nathan and Shao, Shu-Heng}
}
