Chanfreau, S., L. N. He, and B. Yu. “Electrochemical Behaviour Of Ferrocene/Ferricinium Redox System In Pure And CO2 Saturated [C6MIM][PF6]”. ASEAN Journal of Chemical Engineering, Vol. 11, no. 2, Dec. 2011, pp. 53-58, https://jurnal.ugm.ac.id/v3/AJChE/article/view/8091.