1. 1) S. Scheithauer and R. Mayer, Topics in Sulphur Chemistry (Ed. A. Senning), Vol. 4, Academic Press, p .4 (1978).
2. 2) H. Berge, B. Stesen, M. Aqilia, and E. Peseke, Wiss. Z. Wilhelm-pieck-Univ., Rostock, 27, 639 (1978) (Chem. Abstr., 93, 94899 v (1980)).
3. 3) G. Le Guillanton, Sulfur Reports, 12, 405 (1992).
4. 4) G. Le Guillanton, Q. T. Do, and J. Simonet, Tetrahedron Lett., 27, 2261 (1986).
5. 5) A. Kunugi, K. Kuwamura, M. Inoue, Y. Kawamura, and K. Abe, Electrochim. Acta, 41, 1987 (1996).