1. Vlcek, A. A... Collection Czechoslov,Chem. Communs., 1955,20, 1507; 1959,24, 181;Chem. Listy, 1955,49, 565.
2. Kolthoff, I. M. and Coetzee, J. F.J. Amer. Chem. Soc., 1957,79, 1852.
3. Almagro, V. Almagro, J. and Sancho, J.Proc. Third Intern. Congr. Polarography, Southampton, Ed., G. J. Hills, Vol. 1, p. 667.
4. Coetzee, J. F. and Wei-San-Siao.Inorg. Chem., 1963,2, 14.
5. Greenough, M. L., Williams, Jr., W. E. and Taylor, J. K.Rev. Sci. Instr., 1951,22, 484.