P. Swain, C. Mallika, C. J. Rao, U. K. Mudali, and R. Natarajan, Journal of Applied Electrochemistry, vol.45, pp.209-216, 2015.

J. M. Fletcher, C. E. Lyon, and A. G. Wain, Journal of Inorganic & Nuclear Chemistry, vol.27, pp.1841-1851, 1965.

G. Rudstam, Acta Chemica Scandinavica, vol.13, pp.1481-1501, 1959.

G. G. Boswell and S. Soentono, Journal of Inorganic & Nuclear Chemistry, vol.43, pp.1625-1632, 1981.