1. Vogel, Text book of Quantitative Chemical Analysis, ELBS with Longman (1991) 405.
2. G. Absalan, Y. Alipour, Analytical Sciences 19 (2003) 635.
3. D.X. Cheng, H.W. Zhang, J. Chinese Chem. Soc. 50 50 (2003) 437.
4. N. Pourreza, M. Behpour, Anal. Sci. 14 (1998) 997.
5. A. Safavi, M.-R. Hormozi Nezhad, E. Shams, Analytica Chimica Acta 409 (2000) 283.