1. A. B. Volynskii,Zh. Anal. Khim.,42, No. 9, 1541 (1987).
2. J. W. Steimer,6th Int. Trace Elem. Symp.: Abstracts of Papers, Jena (1989),1, 217–220.
3. C. Yoshimura and T. Fujino,Chem. Express,6, No. 5, 305–308 (1991).
4. É. S. Zolotovitskaya, V. G. Potapova, N. N. Grebenyuk and A. B. Blank,Zh. Anal. Khim.,50, No. 9, 998–1002 (1995).
5. G. R. Fuchs-Pohl and K. Solinska,ICP Int. Newslett.,18, No. 2, 87–88 (1992).