@book{6328,
	author = {United States Pharmacopeal Convention Incorporation},
	title = {USP xxii NF xvii supplement no - 4},
	publisher = {United State Pharmacopeial Convention Incorporation},
	year = {1991},
	address = {Rockville},
	edition = {17th},
	note = {3360 / 93 - 94 / 09.07.1993}
}