@book{30137,
	author = {Hong, E. H.},
	title = {Anti-influenza activity of betulinic acid from Zizyphus jujuba on influenza A/PR/8 virus},
	url = {https://drive.google.com/file/d/1GRpsusCFfyhqQz--jIVFumvQhr0rVQkB/view?usp=drivesdk}
}