references:

● Neghmouche, N.S., Khelef, A. and Lanez, T., 2009. Electrochemistry characterization of ferrocene/ferricenium redox couple at glassycarbon electrode. Journal of Fundamental and Applied Sciences, 1(2), pp.23-30.
● Cyclic Voltammetry of Ferrocene, [Ru(bpy)3] 2+ , [Co(bpy)3]2+ and Iodide by Branch, E., Carlos R. Cabrera.