@article {31037,
	title = {Lieb\&ndash;Schultz\&ndash;Mattis theorem and the filling constraint},
	journal = {Letters in Mathematical Physics},
	volume = {111},
	year = {2021},
	url = {https://doi.org/10.1007/s11005-021-01480-4},
	author = {H. Chen}
}
