“Electrochemical reversibility of Me6Fc/Me6Fc+PF6- and Me8Fc/Me8Fc+PF6- redox systems in acetonitrile: Original scientific paper”, J. Electrochem. Sci. Eng., vol. 11, no. 4, pp. 221–225, Aug. 2021, doi: 10.5599/jese.1032.