@article{202009.0320,
	doi = {10.20944/preprints202009.0320.v1},
	url = {https://doi.org/10.20944/preprints202009.0320.v1},
	year = 2020,
	month = {September},
	publisher = {Preprints},
	author = {Yijun Yuan},
	title = {Reciprocal Personal/Public Protection for COVID-19 with Mask Discriminating Mouth and Nose},
	journal = {Preprints}
}