[1] J. Li, Y. Liu, W. Sun, and M. Cheng, Chin. J. Public Health (in Chinese) 22, 177 (2004).
[2] P. Moller, M. Viscovich, J. Lykkesfeldt, S. Loft, A. Jensen, and H. E. Polusen, Eur. J. Nutr. 43, 1 (2004).
[3] D. Zhou and W. Ke, Spectroscopy and Spectral Analysis 24, 1370 (2004).
[4] W. Ke, D. Yu, and J. Wu, Spectrochimica Acta Part A 55, 1081 (1999).
[5] C. Jiang, Z. Zeng, and Q. Zhang, Hygiene Fascicule of Overseas Physic (in Chinese) 26, 147 (1999).
[6] F. Yu, Hygiene Fascicule of Overseas Physic (in Chinese) 29, 141 (2002).
[7] H. Zhao, Y. Yu, and Z. Zhang, Chin. Science Bulletin (in Chinese) 43, 955 (1998).
