2BAI Ling, NI Yong-nian(白玲, 倪永年). Chinese J. Anal.Chem(分析化学), 2002, 21(1): 39.
3Editorial Committee of the Pharmacopoeia of People's Republic of China(中华人民共和国国家药典委员会). The Pharmacopoeia of People's Republic of China (Part Ⅱ)(中华人民共和国药典(二部)). Beijing(北京): Chemical Industry