[1] US Pharmacopeial Forum, 1996; 22(1):1940.
[2] USP ⅩⅩⅢ, USPC Inc, 12601 Twinbrook Park-way, Rockville, MD 20852, 1994.
[3] US Pharmacopeial Forum, 1996; 22(1):1735.
[4] US Pharmacopeial Folum, 1997; 23(5):4861.
[5] US Pharmacopeial Folum, 1998; 24(2):5972.
[6] The Eighth Supplement of USP ⅩⅩⅢ.