@book{56,
	author = {"Boylestad , Robert L."},
	title = {Introductory circuit analysis},
	publisher = {Prentice Hall },
	year = {1997},
	address = {New Jersey},
	edition = {8 th},
	url = {https://libgen.is/book/index.php?md5=4DC5571D6F5BB7C148E784E6A2E4669F}
}