@book{7698,
	author = {Date, C. J.},
	title = {An introduction to database systems},
	publisher = {Addison Wesley Publishing},
	address = {SINGAPORE},
	edition = {7th},
	url = {https://libgen.is/book/index.php?md5=E24FA2F97BEC0CD80D36D069E5455722}
}